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  Subjects -> PHYSICS (Total: 800 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (21 journals)
    - NUCLEAR PHYSICS (51 journals)
    - OPTICS (86 journals)
    - PHYSICS (576 journals)
    - SOUND (25 journals)
    - THERMODYNAMICS (32 journals)

PHYSICS (576 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: 20)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Advanced Composite Materials     Hybrid Journal   (Followers: 66)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Materials     Hybrid Journal   (Followers: 257)
Advanced Science Focus     Free   (Followers: 3)
Advanced Structural and Chemical Imaging     Open Access   (Followers: 2)
Advanced Studies in Theoretical Physics     Open Access  
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: 20)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
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: 11)
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: 11)
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: 32)
Applied Physics Research     Open Access   (Followers: 3)
Applied Physics Reviews     Hybrid Journal   (Followers: 8)
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: 43)
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   (Followers: 1)
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: 11)
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: 183)
Composites Part B : Engineering     Hybrid Journal   (Followers: 286)
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: 3)
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: 7)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 7)
Cryogenics     Hybrid Journal   (Followers: 51)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 60)
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: 41)
Energy Procedia     Open Access   (Followers: 2)
Engineering Failure Analysis     Hybrid Journal   (Followers: 69)
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 Physical Journal - Applied Physics     Full-text available via subscription   (Followers: 17)
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: 14)
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: 30)
Geografiska Annaler, Series A : Physical Geography     Hybrid Journal   (Followers: 3)
Geophysical Research Letters     Full-text available via subscription   (Followers: 130)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 156)
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: 7)
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: 68)
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: 41)
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: 23)
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: 34)
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: 37)
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: 35)
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]
  • Statistical analysis of severe magnetic fluctuations in the near-Earth
           plasma sheet observed by THEMIS-E

    • Abstract: Statistical analysis of severe magnetic fluctuations in the near-Earth plasma sheet observed by THEMIS-E
      Heqiucen Xu, Kazuo Shiokawa, and Dennis Frühauff
      Ann. Geophys., 35, 1131-1142, https://doi.org/10.5194/angeo-35-1131-2017, 2017
      In this study, we statistically analyzed severe magnetic fluctuations in the nightside near-Earth plasma sheet. For the first time, we showed the occurrence rates of these fluctuations. The superposed epoch analysis also indicated that the flow speed increases before the severe magnetic fluctuations. We also discussed how both the inside-out and outside-in substorm models can be used to explain these observed results.
      PubDate: 2017-10-09T15:11:50+02:00
       
  • Ionospheric F-region response to the 26 September 2011 geomagnetic storm
           in the Antarctica American and Australian sectors

    • Abstract: Ionospheric F-region response to the 26 September 2011 geomagnetic storm in the Antarctica American and Australian sectors
      Emilia Correia, Luca Spogli, Lucilla Alfonsi, Claudio Cesaroni, Adriana M. Gulisano, Evan G. Thomas, Ray F. Hidalgo Ramirez, and Alexandre A. Rodel
      Ann. Geophys., 35, 1113-1129, https://doi.org/10.5194/angeo-35-1113-2017, 2017
      Ionospheric disturbances observed in Antarctica during a moderately strong geomagnetic storm caused by the impact of a coronal mass ejection from the Sun are presented here. The ionosphere behavior was analyzed using GNSS and ionosonde observations at middle and high latitudes. The results showed that the impact promptly affected the ionosphere from the Equator to the high latitudes, resulting in strong irregularities, particularly at middle and high latitudes, which can affect GPS users.
      PubDate: 2017-10-05T15:11:50+02:00
       
  • Two-stream instabilities from the lower-hybrid frequency to the electron
           cyclotron frequency: application to the front of quasi-perpendicular
           shocks

    • Abstract: Two-stream instabilities from the lower-hybrid frequency to the electron cyclotron frequency: application to the front of quasi-perpendicular shocks
      Laurent Muschietti and Bertrand Lembège
      Ann. Geophys., 35, 1093-1112, https://doi.org/10.5194/angeo-35-1093-2017, 2017
      We examine the wave activity that can possibly develop in the foot of quasi-perpendicular plasma shock, as it arises from the relative drifts of three particle populations across the background magnetic field: ions incoming toward the shock, ions reflected from the shock, and electrons. The goal is to consider the role of different wave propagation angles with respect to the magnetic field. Three types of instabilities are identified which could play a role in shock dissipation.
      PubDate: 2017-09-15T10:52:41+02:00
       
  • Bulgarian Geomagnetic Reference Field (BulGRF) for 2015.0 and secular
           variation prediction model up to 2020

    • Abstract: Bulgarian Geomagnetic Reference Field (BulGRF) for 2015.0 and secular variation prediction model up to 2020
      Metodi Metodiev and Petya Trifonova
      Ann. Geophys., 35, 1085-1092, https://doi.org/10.5194/angeo-35-1085-2017, 2017
      For regional studies and practical use regional-scale models of the geomagnetic field are necessary. The Bulgarian Geomagnetic Reference Field (BulGRF) for 2015.0 epoch and prediction up to 2020.0 is produced and presented in this paper. It uses data from Panagyurishte (PAG) observatory and the Bulgarian secular network. As a result, our model gives a set of six coefficients which allow the users to obtain the main field values using only the geographic coordinates and a simple calculator.
      PubDate: 2017-09-12T14:18:35+02:00
       
  • Statistical study of auroral omega bands

    • Abstract: Statistical study of auroral omega bands
      Noora Partamies, James M. Weygand, and Liisa Juusola
      Ann. Geophys., 35, 1069-1083, https://doi.org/10.5194/angeo-35-1069-2017, 2017
      Large-scale undulations of the diffuse aurora boundary, auroral omega bands, have been studied based on 438 omega-like structures identified over Fennoscandian Lapland from 1996 to 2007. The omegas mainly occurred in the post-magnetic midnight sector, in the region between oppositely directed ionospheric field-aligned currents, and during substorm recovery phases. The omega bands were observed during substorms, which were more intense than the average substorm in the same region.
      PubDate: 2017-09-07T14:18:35+02:00
       
  • Catalog of fine-structured electron velocity distribution functions –
           Part 1: Antiparallel magnetic-field reconnection (Geospace Environmental
           Modeling case)

    • Abstract: Catalog of fine-structured electron velocity distribution functions – Part 1: Antiparallel magnetic-field reconnection (Geospace Environmental Modeling case)
      Philippe-A. Bourdin
      Ann. Geophys., 35, 1051-1067, https://doi.org/10.5194/angeo-35-1051-2017, 2017
      From computer simulations we study how free electrons behave in a region where opposite magnetic fields interact. The particles get disturbed and change their velocity and energy, similar to what happens in the tail of the magnetic field on the nightside of the Earth or during magnetic outburst events on the Sun. We provide a catalog of those particle velocities that are specific to their location within the magnetic field. Scientists may use the data for comparison with satellite observations.
      PubDate: 2017-09-05T11:34:30+02:00
       
  • Nanodust dynamics during a coronal mass ejection

    • Abstract: Nanodust dynamics during a coronal mass ejection
      Andrzej Czechowski and Jens Kleimann
      Ann. Geophys., 35, 1033-1049, https://doi.org/10.5194/angeo-35-1033-2017, 2017
      Interplanetary dust also includes very small (nanometer-sized) particles. The dynamics of nanodust is determined by electromagnetic forces, which accelerate the dust to velocities on the order of 500 km s−1 or, in the vicinity of the Sun, trap them in bound orbits. We investigate the behavior of nanodust during a coronal mass ejection. We find a new population of extremely fast (1000 km s−1) nanodust. We also study the effect of the ion drag force.
      PubDate: 2017-09-04T11:34:30+02:00
       
  • Effects of the planetary waves on the MLT airglow

    • Abstract: Effects of the planetary waves on the MLT airglow
      Fabio Egito, Hisao Takahashi, and Yasunobu Miyoshi
      Ann. Geophys., 35, 1023-1032, https://doi.org/10.5194/angeo-35-1023-2017, 2017
      The planetary-wave-induced airglow variability in the mesosphere and lower thermosphere (MLT) is investigated using simulations with thegeneral circulation model (GCM) of Kyushu University. The modelcapabilities enable us to simulate the MLT OI557.7 nm, O2b(0–1), andOH(6–2) emissions. The simulations were performed for the lower-boundarymeteorological conditions of 2005. The spectral analysis reveals that atmiddle latitudes, oscillations of the emission rates with the period of2–20 days appear throughout the year. The 2-day oscillations are prominentin the summer and the 5-, 10-, and 16-day oscillations dominate from the autumn tospring equinoxes. The maximal amplitude of the variations induced by theplanetary waves was 34 % in OI557.7 nm, 17 % in O2b(0–1), and8 % in OH(6–2). The results were compared to those observed in themiddle latitudes. The GCM simulations also enabled us to investigate verticaltransport processes and their effects on the emission layers. The verticaltransport of atomic oxygen exhibits similar periodic variations to thoseobserved in the emission layers induced by the planetary waves. The resultsalso show that the vertical advection of atomic oxygen due to the wave motionis an important factor in the signatures of the planetary waves in theemission rates.
      PubDate: 2017-08-31T11:34:30+02:00
       
  • Occurrence rate of dipolarization fronts in the plasma sheet: Cluster
           observations

    • Abstract: Occurrence rate of dipolarization fronts in the plasma sheet: Cluster observations
      Sudong Xiao, Tielong Zhang, Guoqiang Wang, Martin Volwerk, Yasong Ge, Daniel Schmid, Rumi Nakamura, Wolfgang Baumjohann, and Ferdinand Plaschke
      Ann. Geophys., 35, 1015-1022, https://doi.org/10.5194/angeo-35-1015-2017, 2017
      We investigate the occurrence rate of dipolarization fronts(DFs) in the plasma sheet by taking full advantage of all four Clustersatellites (C1–4) from years 2001 to 2009. In total, we select 466joint-observation DF events, in which 318, 282, 254, and 236 DFs are observedby C1, C2, C3, and C4, respectively. Our findings are as follows: (1) themaximum occurrence rate is ∼ 15.3 events per day atX ∼ 15 RE in the XY plane, and the average occurrencerate is ∼ 5.4 events per day over the whole observation period; (2) theoccurrence rate on the dusk side of the plasma sheet is larger and decreaseswith increasing BXY∕BLobe; (3) the occurrence rate within Y   <  6 RE increases gradually from X ≈ −19to −15 RE and then decreases from X ≈ −15 to−10 RE; (4) the occurrence rate when AE > 200 nT is muchlarger than that when AE < 200 nT, indicating that DFs preferentiallyoccur during high geomagnetic activity. The magnetic pileup and earthward andduskward ion flows could contribute to the increases in the occurrence ratefrom X ≈ −19 to −15 RE. We suggest that bothgeomagnetic activity and multiple DFs contribute to the high occurrence rateof the DFs. In addition, the finite length of the DF in the dawn–duskdirection can affect the chance that a satellite observes the DF.
      PubDate: 2017-08-29T11:34:30+02:00
       
  • Electron cyclotron maser instability (ECMI) in strong magnetic guide field
           reconnection

    • Abstract: Electron cyclotron maser instability (ECMI) in strong magnetic guide field reconnection
      Rudolf A. Treumann and Wolfgang Baumjohann
      Ann. Geophys., 35, 999-1013, https://doi.org/10.5194/angeo-35-999-2017, 2017
      It is suggested that collisionless reconnection under conditions of very strong current-parallel guide fields in dilute plasmas should become a rather efficient source of electromagnetic radiation in the free space modes X and O and their harmonics. The mechanism is based on the electron cyclotron maser instability (ECMI), which can be excited by the anisotropic weakly relativistic electron distribution in the many inertial lengths long electron exhausts caused in reconnection.
      PubDate: 2017-08-28T11:34:30+02:00
       
  • Estimate of size distribution of charged MSPs measured in situ in winter
           during the WADIS-2 sounding rocket campaign

    • Abstract: Estimate of size distribution of charged MSPs measured in situ in winter during the WADIS-2 sounding rocket campaign
      Heiner Asmus, Tristan Staszak, Boris Strelnikov, Franz-Josef Lübken, Martin Friedrich, and Markus Rapp
      Ann. Geophys., 35, 979-998, https://doi.org/10.5194/angeo-35-979-2017, 2017
      This work sheds new light on the size distribution of dust grains of meteoric origin in the mesosphere and lower thermosphere region using rocket-borne instrumentation. We found that a large number of very small (~ 0.5 nm) particles are charged and therefore have a significant influence on the charge balance of the lower ionosphere.
      PubDate: 2017-08-24T11:34:30+02:00
       
  • The electric current approach in the solar–terrestrial relationship

    • Abstract: The electric current approach in the solar–terrestrial relationship
      Syun-Ichi Akasofu
      Ann. Geophys., 35, 965-978, https://doi.org/10.5194/angeo-35-965-2017, 2017
      The sequence of phenomena consisting of solar flares, coronal mass ejections (CMEs), auroral substorm, and geomagnetic storms is mostly a manifestation of electromagnetic energy dissipation. Thus, first of all, it is natural to consider each of them in terms of a sequence of power supply (dynamo), power transmission (electric currents/circuits), and dissipation (mostly observed phenomena), i.e., as an input–output process and the electric current line approach.
      PubDate: 2017-08-21T11:34:30+02:00
       
  • 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
       
 
 
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