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  Subjects -> PHYSICS (Total: 798 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (21 journals)
    - NUCLEAR PHYSICS (51 journals)
    - OPTICS (86 journals)
    - PHYSICS (573 journals)
    - SOUND (26 journals)
    - THERMODYNAMICS (32 journals)

PHYSICS (573 journals)                  1 2 3 | Last

Showing 1 - 200 of 741 Journals sorted alphabetically
Acta Acustica united with Acustica     Full-text available via subscription   (Followers: 7)
Acta Mechanica     Hybrid Journal   (Followers: 19)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Advanced Composite Materials     Hybrid Journal   (Followers: 65)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Materials     Hybrid Journal   (Followers: 251)
Advanced Science Focus     Free   (Followers: 3)
Advanced Structural and Chemical Imaging     Open Access   (Followers: 2)
Advances in Condensed Matter Physics     Open Access   (Followers: 8)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Geophysics     Full-text available via subscription   (Followers: 6)
Advances in High Energy Physics     Open Access   (Followers: 19)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 19)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances In Physics     Hybrid Journal   (Followers: 19)
Advances in Physics : X     Open Access  
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Remote Sensing     Open Access   (Followers: 37)
AIP Advances     Open Access   (Followers: 8)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 3)
American Journal of Condensed Matter Physics     Open Access   (Followers: 4)
American Journal of Signal Processing     Open Access   (Followers: 10)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 3)
Annalen der Physik     Hybrid Journal   (Followers: 5)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 15)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3)
Annales UMCS, Physica     Open Access  
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5)
Annals of Physics     Hybrid Journal   (Followers: 4)
Annals of West University of Timisoara - Physics     Open Access   (Followers: 1)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 4)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 10)
Annual Review of Condensed Matter Physics     Full-text available via subscription  
Annual Review of Materials Research     Full-text available via subscription   (Followers: 5)
APL Materials     Open Access   (Followers: 12)
Applied Composite Materials     Hybrid Journal   (Followers: 48)
Applied Physics A     Hybrid Journal   (Followers: 7)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 33)
Applied Physics Research     Open Access   (Followers: 3)
Applied Physics Reviews     Hybrid Journal   (Followers: 9)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 5)
Archive for Rational Mechanics and Analysis     Hybrid Journal  
Asia Pacific Physics Newsletter     Hybrid Journal  
ASTRA Proceedings     Open Access   (Followers: 1)
Astronomy & Geophysics     Hybrid Journal   (Followers: 47)
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 21)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 8)
Atoms     Open Access   (Followers: 1)
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 10)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Axioms     Open Access  
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 2)
Berkala Fisika Indonesia     Open Access  
Biomaterials     Hybrid Journal   (Followers: 44)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Biophysical Reviews     Hybrid Journal   (Followers: 1)
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 3)
BMC Biophysics     Open Access   (Followers: 5)
Boson Journal of Modern Physics     Open Access   (Followers: 11)
Brazilian Journal of Physics     Hybrid Journal  
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Materials Science     Open Access   (Followers: 42)
Bulletin of the Atomic Scientists     Hybrid Journal   (Followers: 3)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (Followers: 1)
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal  
Caderno Brasileiro de Ensino de Física     Open Access  
Canadian Journal of Physics     Hybrid Journal   (Followers: 13)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 10)
Cells     Open Access   (Followers: 2)
CERN courier. International journal of high energy physics     Free   (Followers: 7)
Chemical Physics of Solid Surfaces     Full-text available via subscription  
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 13)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Chinese Journal of Physics     Hybrid Journal  
Chinese Physics B     Full-text available via subscription  
Chinese Physics C     Full-text available via subscription  
Chinese Physics Letters     Full-text available via subscription  
Cogent Physics     Open Access   (Followers: 1)
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Colloid Journal     Hybrid Journal   (Followers: 2)
Communications in Mathematical Physics     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Communications in Theoretical Physics     Full-text available via subscription   (Followers: 3)
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 179)
Composites Part B : Engineering     Hybrid Journal   (Followers: 228)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 21)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 2)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Physics Communications     Hybrid Journal   (Followers: 6)
Contemporary Concepts of Condensed Matter Science     Full-text available via subscription  
Contemporary Physics     Hybrid Journal   (Followers: 26)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 7)
Cryogenics     Hybrid Journal   (Followers: 49)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 58)
Diagnostic and Interventional Imaging     Full-text available via subscription  
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Doklady Physics     Hybrid Journal   (Followers: 1)
Dynamical Properties of Solids     Full-text available via subscription  
ECS Journal of Solid State Science and Technology     Hybrid Journal   (Followers: 6)
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 19)
EJNMMI Physics     Open Access  
Electrospinning     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 40)
Energy Procedia     Open Access   (Followers: 2)
Engineering Failure Analysis     Hybrid Journal   (Followers: 68)
Engineering Fracture Mechanics     Hybrid Journal   (Followers: 23)
Environmental Fluid Mechanics     Hybrid Journal   (Followers: 5)
EPJ Nonlinear Biomedical Physics     Open Access  
EPJ Quantum Technology     Open Access  
EPJ Techniques and Instrumentation     Full-text available via subscription  
EPJ Web of Conferences     Open Access  
European Journal of Physics     Full-text available via subscription   (Followers: 18)
European Journal of Physics Education     Open Access   (Followers: 3)
European Physical Journal - Applied Physics     Full-text available via subscription   (Followers: 16)
European Physical Journal C     Hybrid Journal   (Followers: 1)
Europhysics News     Open Access  
Experimental Mechanics     Hybrid Journal   (Followers: 22)
Experimental Methods in the Physical Sciences     Full-text available via subscription  
Experimental Techniques     Hybrid Journal   (Followers: 56)
Exploration Geophysics     Hybrid Journal   (Followers: 4)
Few-Body Systems     Hybrid Journal  
Fire and Materials     Hybrid Journal   (Followers: 5)
Flexible Services and Manufacturing Journal     Hybrid Journal   (Followers: 1)
Fluctuation and Noise Letters     Hybrid Journal   (Followers: 1)
Fluid Dynamics     Hybrid Journal   (Followers: 13)
Fortschritte der Physik/Progress of Physics     Hybrid Journal  
Frontiers in Physics     Open Access   (Followers: 6)
Frontiers of Materials Science     Hybrid Journal   (Followers: 3)
Frontiers of Physics     Hybrid Journal   (Followers: 2)
Fusion Engineering and Design     Hybrid Journal   (Followers: 10)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 28)
Geografiska Annaler, Series A : Physical Geography     Hybrid Journal   (Followers: 3)
Geophysical Research Letters     Full-text available via subscription   (Followers: 121)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 145)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 4)
Global Journal of Physics     Open Access   (Followers: 2)
Granular Matter     Hybrid Journal   (Followers: 1)
Graphs and Combinatorics     Hybrid Journal   (Followers: 6)
Gravitation and Cosmology     Hybrid Journal   (Followers: 3)
Handbook of Geophysical Exploration: Seismic Exploration     Full-text available via subscription  
Handbook of Metal Physics     Full-text available via subscription  
Handbook of Surface Science     Full-text available via subscription   (Followers: 3)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription   (Followers: 1)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 3)
Heat Transfer - Asian Research     Hybrid Journal   (Followers: 12)
High Energy Density Physics     Hybrid Journal   (Followers: 2)
High Pressure Research: An International Journal     Hybrid Journal   (Followers: 3)
IEEE Journal of Quantum Electronics     Hybrid Journal   (Followers: 21)
IEEE Signal Processing Magazine     Full-text available via subscription   (Followers: 66)
IET Optoelectronics     Hybrid Journal   (Followers: 1)
Il Colle di Galileo     Open Access  
Image Analysis & Stereology     Open Access  
Imaging Science Journal     Hybrid Journal   (Followers: 2)
Indian Journal of Biochemistry and Biophysics (IJBB)     Open Access   (Followers: 3)
Indian Journal of Physics     Hybrid Journal   (Followers: 20)
Indian Journal of Pure & Applied Physics (IJPAP)     Open Access   (Followers: 38)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 36)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 40)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Infinite Dimensional Analysis, Quantum Probability and Related Topics     Hybrid Journal  
InfraMatics     Open Access  
Infrared Physics & Technology     Hybrid Journal   (Followers: 11)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 8)
Intermetallics     Hybrid Journal   (Followers: 22)
International Applied Mechanics     Hybrid Journal   (Followers: 3)
International Geophysics     Full-text available via subscription   (Followers: 3)
International Heat Treatment and Surface Engineering     Hybrid Journal   (Followers: 5)
International Journal for Computational Methods in Engineering Science and Mechanics     Hybrid Journal   (Followers: 11)
International Journal for Ion Mobility Spectrometry     Hybrid Journal   (Followers: 1)
International Journal for Simulation and Multidisciplinary Design Optimization     Open Access   (Followers: 4)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 33)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 23)
International Journal of Computational Materials Science and Surface Engineering     Hybrid Journal   (Followers: 6)
International Journal of Damage Mechanics     Hybrid Journal   (Followers: 5)
International Journal of Fatigue     Hybrid Journal   (Followers: 34)
International Journal of Fracture     Hybrid Journal   (Followers: 12)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 2)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 34)
International Journal of Low Radiation     Hybrid Journal  
International Journal of Low-Carbon Technologies     Open Access   (Followers: 1)
International Journal of Mass Spectrometry     Hybrid Journal   (Followers: 17)
International Journal of Material Forming     Hybrid Journal   (Followers: 1)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 4)
International Journal of Mechanical Sciences     Hybrid Journal   (Followers: 12)

        1 2 3 | Last

Journal Cover Annales Geophysicae (ANGEO)
  [SJR: 1.105]   [H-I: 73]   [15 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 0992-7689 - ISSN (Online) 1432-0576
   Published by Copernicus Publications Homepage  [49 journals]
  • No title

    • Abstract: Estimating error statistics for Chambon-la-Forêt observatory definitive data
      Vincent Lesur, Benoît Heumez, Abdelkader Telali, Xavier Lalanne, and Anatoly Soloviev
      Ann. Geophys., 35, 939-952, https://doi.org/10.5194/angeo-35-939-2017, 2017
      Chambon-la-Forêt magnetic observatory distributes definitive second data that are contaminated by noise with a standard variation below 400 pT. This noise is low compared to the international standard set by INTERMAGNET. It is mainly due to local signals of unknown origins that have short wavelengths in space (less than 200 m) and in time (less than a day).
      PubDate: 2017-08-17T09:53:53+02:00
       
  • No title

    • Abstract: Effects of the midnight temperature maximum observed in the thermosphere–ionosphere over the northeast of Brazil
      Cosme Alexandre O. B. Figueiredo, Ricardo A. Buriti, Igo Paulino, John W. Meriwether, Jonathan J. Makela, Inez S. Batista, Diego Barros, and Amauri F. Medeiros
      Ann. Geophys., 35, 953-963, https://doi.org/10.5194/angeo-35-953-2017, 2017
      The midnight temperature maximum (MTM) has been observed in the lowerthermosphere by two Fabry–Pérot interferometers (FPIs) at São Joãodo Cariri (7.4° S, 36.5° W) andCajazeiras (6.9° S, 38.6° W) during 2011,when the solar activity was moderate and the solar flux was between 90 and155 SFU (1 SFU  =  10−22 W m−2 Hz−1). The MTM isstudied in detail using measurements of neutral temperature, wind and airglowrelative intensity of OI630.0 nm (referred to as OI6300), and ionosphericparameters, such as virtual height (h′F), the peak height of the F2 region(hmF2), and critical frequency of the F region (foF2),which were measured by a Digisonde instrument (DPS) at Eusébio(3.9° S, 38.4° W; geomagnetic coordinates 7.31° S,32.40° E for 2011). The MTM peak was observed mostly along the year,except in May, June, and August. The amplitudes of the MTM varied from64 ± 46 K in April up to 144 ± 48 K in October. The monthlytemperature average showed a phase shift in the MTM peak around 0.25 h inSeptember to 2.5 h in December before midnight. On the other hand, inFebruary, March, and April the MTM peak occurred around midnight.International Reference Ionosphere 2012 (IRI-2012) model was compared to theneutral temperature observations and the IRI-2012 model failed in reproducingthe MTM peaks. The zonal component of neutral wind flowed eastward the wholenight; regardless of the month and the magnitude of the zonal wind, it wastypically within the range of 50 to 150 m s−1 during the earlyevening. The meridional component of the neutral wind changed its directionover the months: from November to February, the meridional wind in the earlyevening flowed equatorward with a magnitude between 25 and 100 m s−1;in contrast, during the winter months, the meridional wind flowed to the polewithin the range of 0 to −50 m s−1. Our results indicate that thereversal (changes in equator to poleward flow) or abatement of the meridionalwinds is an important factor in the MTM generation. From February to Apriland from September to December, the h′F and the hmF2 showed anincrease around 18:00–20:00 LT within a range between 300 and 550 km andreached a minimal height of about 200–300 km close to midnight; then thelayer rose again by about 40 km or, sometimes, remained at constant height.Furthermore, during the winter months, the h′F and hmF2 showed adifferent behavior; the signature of the pre-reversal enhancement did notappear as in other months and the heights did not exceed 260 and 350 km. Ourobservation indicated that the midnight collapse of the F region was aconsequence of the MTM in the meridional wind that was reflected in theheight of the F region. Lastly, the behavior of the OI6300 showed, fromFebruary to April and from September to December, an increase in intensityaround midnight or 1 h before, which was associated with the MTM, whereas,from May to August, the relative intensity was more intense in the earlyevening and decayed during the night.
      PubDate: 2017-08-17T09:53:53+02:00
       
  • No title

    • Abstract: Similarity and differences in morphology and mechanisms of the foF2 and TEC disturbances during the geomagnetic storms on 26–30 September 2011
      Maxim V. Klimenko, Vladimir V. Klimenko, Irina E. Zakharenkova, Konstantin G. Ratovsky, Nina A. Korenkova, Yury V. Yasyukevich, Anna A. Mylnikova, and Iurii V. Cherniak
      Ann. Geophys., 35, 923-938, https://doi.org/10.5194/angeo-35-923-2017, 2017
      Using model–data analysis we emphasize a new result – formation of the positive daytime disturbances in foF2 and TEC at middle and low latitudes due to n(O)/n(N2) enhancement during the recovery storm phase. The spatial extent of this phenomenon depends on the longitudinal sector. The positive disturbances in the electron content at heights of 800–20 000 km at high latitudes can appear simultaneously with the negative disturbances in TEC and foF2 due to electron and neutral temperature heating.
      PubDate: 2017-08-09T09:53:53+02:00
       
  • No title

    • Abstract: The impact on global magnetohydrodynamic simulations from varying initialisation methods: results from GUMICS-4
      Antti Lakka, Tuija I. Pulkkinen, Andrew P. Dimmock, Adnane Osmane, Ilja Honkonen, Minna Palmroth, and Pekka Janhunen
      Ann. Geophys., 35, 907-922, https://doi.org/10.5194/angeo-35-907-2017, 2017
      We studied the impact on global MHD simulations from different simulation initialisation methods. While the global MHD code used is GUMICS-4 we conclude that the results might be generalisable to other codes as well. It is found that different initialisation methods affect the dynamics of the Earth's space environment by creating differences in momentum transport several hours afterwards. These differences may even grow as a response to rapid solar wind condition changes.
      PubDate: 2017-08-01T09:53:53+02:00
       
  • No title

    • Abstract: Bursty emission of whistler waves in association with plasmoid collision
      Keizo Fujimoto
      Ann. Geophys., 35, 885-892, https://doi.org/10.5194/angeo-35-885-2017, 2017
      A large energy release can occur in association with magnetic field line reconnection. In order to understand the detailed process of the energy release, accurate satellite observations are invaluable. However, it is usually difficult to identify where a single satellite is located with respect to the reconnection process. The present study proposes using a whistler burst to identify the plasmoid collisions and associated electron acceleration in the reconnection process.
      PubDate: 2017-07-31T09:53:53+02:00
       
  • No title

    • Abstract: A comparison of 11-year mesospheric and lower thermospheric winds determined by meteor and MF radar at 69 ° N
      Sven Wilhelm, Gunter Stober, and Jorge L. Chau
      Ann. Geophys., 35, 893-906, https://doi.org/10.5194/angeo-35-893-2017, 2017
      A comparison between winds and tides in the mesosphere and lower thermosphere based on measurements from a meteor radar (MR) and a medium-frequency radar in northern Norway was done to estimate potential biases between the two systems. Our results indicate reasonable agreement for the zonal and meridional wind components between 78 and 92 km. Based on these findings, we have taken the MR data as a reference and thus construct a consistent and homogenous wind from approximately 60 to 110 km.
      PubDate: 2017-07-31T09:53:53+02:00
       
  • No title

    • Abstract: Investigation of  ∼ 20–40 mHz ULF waves and their driving mechanisms in Mercury's dayside magnetosphere
      Elisabet Liljeblad and Tomas Karlsson
      Ann. Geophys., 35, 879-884, https://doi.org/10.5194/angeo-35-879-2017, 2017
      MESSENGER magnetic field data from the magnetosphere of Mercury have been investigated to identify ultra-low-frequency (ULF) waves. ULF waves in the Kelvin–Helmholtz (KH) wave frequency range are frequently observed in the magnetosphere. These ULF waves often have similar characteristics to previously identified, likely KH-driven ULF waves, indicating that ULF waves in a specific frequency band can be used as a detection tool for KH waves on Mercury.
      PubDate: 2017-07-28T09:53:53+02:00
       
  • No title

    • Abstract: Quantification of the total ion transport in the near-Earth plasma sheet
      Rikard Slapak, Maria Hamrin, Timo Pitkänen, Masatoshi Yamauchi, Hans Nilsson, Tomas Karlsson, and Audrey Schillings
      Ann. Geophys., 35, 869-877, https://doi.org/10.5194/angeo-35-869-2017, 2017
      The ion total transports in the near-Earth plasma sheet have been investigated and quantified. Specifically, the net O+ transport is about 1024 s−1 in the earthward direction, which is 1 order of magnitude smaller than the typical O+ ionospheric outflows, strongly indicating that most outflow will eventually escape, leading to significant atmospheric loss. The study also shows that low-velocity flows (
      PubDate: 2017-07-26T09:53:53+02:00
       
  • Global geomagnetic responses to the IMF Bz fluctuations during the
           September/October 2003 high-speed stream intervals

    • Abstract: Global geomagnetic responses to the IMF Bz fluctuations during the September/October 2003 high-speed stream intervals
      Ezequiel Echer, Axel Korth, Mauricio José Alves Bolzan, and Reinhard Hans Walter Friedel
      Ann. Geophys., 35, 853-868, https://doi.org/10.5194/angeo-35-853-2017, 2017
      In this paper, we follow the coupling from the solar wind to theEarth's magnetotail, geosynchronous orbit, auroral zone and to theground, during periods of Alfvénic fluctuations in high-speed solarwind streams (HSSs) and their corotating interaction regions (CIRs). We employcross-wavelet analysis of magnetic field, particle flux and auroralelectrojet (AE) index data forthe HSSs of September and October 2003. Our results show aremarkably consistent periodic response among all of these regions andacross multiple substorm indicators, indicating a possible driven substormresponse of the global magnetosphere to the solar wind interplanetarystructures. Across the seven intervals studied we find a range of periodicresponses from 1.8 to 3.1 h, which is consistent with the 2.75 h peakof the Borovsky et al. (1993) statistical study of inter-substorm periods.
      PubDate: 2017-07-21T13:17:58+02:00
       
  • Urbanization effect on trends in sunshine duration in China

    • Abstract: Urbanization effect on trends in sunshine duration in China
      Yawen Wang, Martin Wild, Arturo Sanchez-Lorenzo, and Veronica Manara
      Ann. Geophys., 35, 839-851, https://doi.org/10.5194/angeo-35-839-2017, 2017
      Through the selection of 172 urban–rural station pairs, this study noted that urbanization significantly influenced the dimming trend in sunshine duration in China from 1960 until it leveled off after 1990. During 1960–1989, rural dimming was around two-thirds the rate of urban dimming; this ratio generally shows a positive correlation with urbanization level. There may be an overestimation of dimming in China when a dataset with more urban-scale sites than rural-scale sites is applied.
      PubDate: 2017-07-18T13:17:58+02:00
       
  • Decadal trends in the diurnal variation of galactic cosmic rays observed
           using neutron monitor data

    • Abstract: Decadal trends in the diurnal variation of galactic cosmic rays observed using neutron monitor data
      Simon Thomas, Mathew Owens, Mike Lockwood, and Chris Owen
      Ann. Geophys., 35, 825-838, https://doi.org/10.5194/angeo-35-825-2017, 2017
      Galactic cosmic rays are high-energy particles from outside of the solar system. The products of their interaction with the atmosphere are counted by a network of neutron monitors. The number of cosmic rays reaching Earth is affected by the magnetic field embedded in the solar wind. The result is a number of regular variations in the neutron monitor data, including a diurnal variation. We have found that this variation is influenced by 1–2 h by the polarity of the Sun's magnetic field.
      PubDate: 2017-07-17T11:54:07+02:00
       
  • Our dynamic sun: 2017 Hannes Alfvén Medal lecture at the EGU

    • Abstract: Our dynamic sun: 2017 Hannes Alfvén Medal lecture at the EGU
      Eric Priest
      Ann. Geophys., 35, 805-816, https://doi.org/10.5194/angeo-35-805-2017, 2017
      A review is given of major progress towards addressing unsolved fundamental puzzles about the Sun. The solar magnetic field is generated by dynamo action in the solar interior. Several mechanisms may heat the corona to 106 K and drive the solar wind. Occasionally, giant flux ropes (prominences) erupt and produce huge CMEs and solar flares. A new theory is presented for the origin of the twist observed in erupting prominences and the nature of reconnection in the rise phase of a flare or CME.
      PubDate: 2017-07-14T11:54:07+02:00
       
  • Comparison between IRI-2012 and GPS-TEC observations over the western
           Black Sea

    • Abstract: Comparison between IRI-2012 and GPS-TEC observations over the western Black Sea
      Samed Inyurt, Omer Yildirim, and Cetin Mekik
      Ann. Geophys., 35, 817-824, https://doi.org/10.5194/angeo-35-817-2017, 2017
      The ionosphere is a dynamic layer which generally changesaccording to radiation emitted by the sun, the movement of the earth aroundthe sun, and sunspot activity. Variations can generally be categorized asregular or irregular variations. Both types of variation have a huge effecton radio wave propagation. In this study, we have focused on the seasonalvariation effect, which is one of the regular forms of variation in terms ofthe ionosphere.
      We examined the seasonal variation over the ZONG station inTurkey for the year 2014. Our analysis results andIRI-2012 present different ideas about ionospheric activity. According to ouranalysed results, the standard deviation reached a maximum value inApril 2014. However, the maximum standard deviationobtained from IRI-2012 was seen in February 2014. Furthermore, it is clearthat IRI-2012 underestimated the VTEC values when compared to our resultsfor all the months analysed. The main source of difference between the twomodels is the IRI-2012 topside ionospheric representation. IRI-2012VTEC has been produced as a result of the integration of an electron densityprofile within altitudinal limits of 60–2000 km. In other words, the mainproblem with regard to the IRI-2012 VTEC representation is not being situated inthe plasmaspheric part of the ionosphere. Therefore we propose thatthe plasmaspheric part should be taken into account to calculate the correctTEC values in mid-latitude regions, and we note that IRI-2012 does not supplyprecise TEC values for use in ionospheric studies.
      PubDate: 2017-07-14T11:54:07+02:00
       
  • On the influence of zonal gravity wave distributions on the Southern
           Hemisphere winter circulation

    • Abstract: On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation
      Friederike Lilienthal, Christoph Jacobi, Torsten Schmidt, Alejandro de la Torre, and Peter Alexander
      Ann. Geophys., 35, 785-798, https://doi.org/10.5194/angeo-35-785-2017, 2017
      Gravity waves (GWs) are one of the most important dynamical features of the middle atmosphere that extends from the tropopause to the lower thermosphere. They originate from the troposphere and propagate upward. Here, we show the impact of the horizontal GW distribution in the lower atmosphere on the dynamics of the middle atmosphere using a global circulation model. As a result, we find that non-zonal GW structures can force additional stationary planetary waves.
      PubDate: 2017-07-13T11:54:07+02:00
       
  • Automatic detection of Sfe: a proposal

    • Abstract: Automatic detection of Sfe: a proposal
      Juan José Curto, Santiago Marsal, Gastón Creci, and Gemma Domingo
      Ann. Geophys., 35, 799-804, https://doi.org/10.5194/angeo-35-799-2017, 2017
      In this paper, we summarize the difficulties that Sfe detection presents and explain a line of work we initiated to overcome these difficulties with the goal of achieving a system capable of performing automatic detection. Some properties of Sfe, including spherical symmetry around the vortex and different time durations between Sfe and other natural variations, were used to construct an index allowing us to detect Sfe.
      PubDate: 2017-07-13T11:54:07+02:00
       
  • Tracking patchy pulsating aurora through all-sky images

    • Abstract: Tracking patchy pulsating aurora through all-sky images
      Eric Grono, Eric Donovan, and Kyle R. Murphy
      Ann. Geophys., 35, 777-784, https://doi.org/10.5194/angeo-35-777-2017, 2017
      The spatial and temporal evolution of the aurora provides information about plasma dynamics throughout the magnetosphere. The THEMIS all-sky imager network has been operating for over 10 years and has accumulated millions of auroral images. To speed the extraction of information from this dataset, it is desirable to implement automated algorithms to track and classify the aurora. This paper demonstrates an automatic method of extracting the motion of the aurora from sequences of images.
      PubDate: 2017-07-03T08:41:41+02:00
       
  • Modelling geomagnetically induced currents in midlatitude Central Europe
           using a thin-sheet approach

    • Abstract: Modelling geomagnetically induced currents in midlatitude Central Europe using a thin-sheet approach
      Rachel L. Bailey, Thomas S. Halbedl, Ingrid Schattauer, Alexander Römer, Georg Achleitner, Ciaran D. Beggan, Viktor Wesztergom, Ramon Egli, and Roman Leonhardt
      Ann. Geophys., 35, 751-761, https://doi.org/10.5194/angeo-35-751-2017, 2017
      This paper describes the study of the effects of solar wind and solar storms on the national electrical power transmission grid in Austria. These storms result in currents in the ground that can cause damage to power grids, particularly those at high latitudes. Results show that very strong solar storms could result in problems in Austria as well, and this information is important to the grid operators to properly implement mitigation strategies in the future.
      PubDate: 2017-06-22T08:41:41+02:00
       
  • Features of 3–7-day planetary-wave-type oscillations in F-layer vertical
           drift and equatorial spread F observed over two low-latitude stations in
           China

    • Abstract: Features of 3–7-day planetary-wave-type oscillations in F-layer vertical drift and equatorial spread F observed over two low-latitude stations in China
      Zhengping Zhu, Weihua Luo, Jiaping Lan, and Shanshan Chang
      Ann. Geophys., 35, 763-776, https://doi.org/10.5194/angeo-35-763-2017, 2017
      Features of planetary waves in Chinese low-latitude regions are investigated. Planetary waves are observed in both MLT winds and ionospheric vertical drifts. ESF occurrence is with the uplift of the F layer caused by PRE, and a delay of about 6 days is observed for planetary waves propagating from the lower atmosphere to the ionosphere. This investigation contributes to the understanding of atmosphere–ionosphere coupling processes and the effects of planetary waves on ESF.
      PubDate: 2017-06-22T08:41:41+02:00
       
  • Exceptionally strong summer-like zonal wind reversal in the upper
           mesosphere during winter 2015/16

    • Abstract: Exceptionally strong summer-like zonal wind reversal in the upper mesosphere during winter 2015/16
      Gunter Stober, Vivien Matthias, Christoph Jacobi, Sven Wilhelm, Josef Höffner, and Jorge L. Chau
      Ann. Geophys., 35, 711-720, https://doi.org/10.5194/angeo-35-711-2017, 2017
      The 2015/16 Northern Hemisphere winter season was marked bypeculiarities in the circulation pattern in the high-latitude mesopauseregion. Wind measurements from the Andenes (69° N, 13° E)meteor radar show westward winds below 84 km and eastward winds above. Thiswind pattern in the zonal wind was observable between the end ofDecember 2015 and the end of January 2016, i.e., conditions that are typicalfor the summer were found during winter. Additional meteor radar measurementsat midlatitude stations did not show such a zonal wind reversal butindicate, together with the polar latitude stations, a reversal of thehorizontal temperature gradient. This is confirmed by global satellitemeasurements. Therefore, it is plausible that the polar latitude summer-likezonal wind reversal in December–January is in accordance with the reversedhorizontal temperature gradient assuming a thermal wind balance between mid-and polar latitudes. The reversed horizontal temperature gradient itself isinduced by stationary planetary waves at lower and midlatitudes in themesosphere, leading to a weakening of the residual circulation above theEuropean sector.
      PubDate: 2017-06-12T13:56:45+02:00
       
  • Atmospheric loss from the dayside open polar region and its dependence on
           geomagnetic activity: implications for atmospheric escape on evolutionary
           timescales

    • Abstract: Atmospheric loss from the dayside open polar region and its dependence on geomagnetic activity: implications for atmospheric escape on evolutionary timescales
      Rikard Slapak, Audrey Schillings, Hans Nilsson, Masatoshi Yamauchi, Lars-Göran Westerberg, and Iannis Dandouras
      Ann. Geophys., 35, 721-731, https://doi.org/10.5194/angeo-35-721-2017, 2017
      In this study, we have used Cluster satellite data to quantify the ionospheric oxygen ion (O+) escape into the solar wind and its dependence on geomagnetic activity. During times of high activity, the escape may be 2 orders of magnitude higher than under quiet conditions, strongly suggesting that the escape rate was much higher when the Sun was young. The results are important for future studies regarding atmospheric loss over geological timescales.
      PubDate: 2017-06-12T13:56:45+02:00
       
 
 
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