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  Subjects -> PHYSICS (Total: 796 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (21 journals)
    - NUCLEAR PHYSICS (51 journals)
    - OPTICS (85 journals)
    - PHYSICS (573 journals)
    - SOUND (25 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: 8)
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: 51)
Advanced Materials     Hybrid Journal   (Followers: 269)
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: 21)
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: 39)
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: 13)
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: 22)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 4)
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: 45)
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 22)
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: 11)
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: 45)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 33)
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: 12)
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: 4)
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: 190)
Composites Part B : Engineering     Hybrid Journal   (Followers: 259)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 20)
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: 52)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 62)
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: 20)
EJNMMI Physics     Open Access  
Electrospinning     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 42)
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: 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: 14)
Fortschritte der Physik/Progress of Physics     Hybrid Journal  
Frontiers in Physics     Open Access   (Followers: 6)
Frontiers of Materials Science     Hybrid Journal   (Followers: 4)
Frontiers of Physics     Hybrid Journal   (Followers: 2)
Fusion Engineering and Design     Hybrid Journal   (Followers: 10)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 31)
Geografiska Annaler, Series A : Physical Geography     Hybrid Journal   (Followers: 3)
Geophysical Research Letters     Full-text available via subscription   (Followers: 135)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 165)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 4)
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: 4)
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: 71)
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: 37)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 42)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 11)
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: 35)
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: 16)
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: 13)
International Journal of Mechanics and Materials in Design     Hybrid Journal   (Followers: 6)

        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]
  • High-intensity, long-duration, continuous AE activity events associated
           with Alfvénic fluctuations in 2003

    • Abstract: High-intensity, long-duration, continuous AE activity events associated with Alfvénic fluctuations in 2003
      Alan Prestes, Virginia Klausner, and Arian Ojeda-González
      Ann. Geophys., 35, 1231-1240, https://doi.org/10.5194/angeo-35-1231-2017, 2017
      The interaction between a fast-speed and a low-speed stream causeslarge-amplitude Alfvénic fluctuations; consequently, the intermittencyand the brief intervals of southward magnetic field associated with Alfvénwaves may cause high levels of AE activity, the so-called high-intensity,long-duration, continuous AE activity (HILDCAA). In this article, the 4 hwindowed Pearson cross-correlation (4WPCC) between the solar wind velocityand the interplanetary magnetic field (IMF) components is performed in orderto confirm that the less strict HILDCAA (HILDCAAs*) events include a largernumber of Alfvén waves than the HILDCAA events, once HILDCAAs disregardpart of the phenomenon. Actually, a HILDCAA event is entirely contained withina HILDCAA* event. However, the opposite is not necessarily true. This articleprovides a new insight, since the increase of Alfvén waves results in anincrease of auroral electrojet activity; consequently, it can causeHILDCAAs* events. Another important aspect of this article is that thesuperposed epoch analysis (SEA) results reaffirm that the HILDCAAs* areassociated with high-speed solar streams (HSSs), and also the HILDCAAs*present the same physical characteristics of the traditional HILDCAA events.
      PubDate: 2017-11-13T09:28:31+01:00
       
  • Unusual behavior of quiet-time zonal and vertical plasma drift velocities
           over Jicamarca during the recent extended solar minimum of 2008

    • Abstract: Unusual behavior of quiet-time zonal and vertical plasma drift velocities over Jicamarca during the recent extended solar minimum of 2008
      Ângela M. Santos, Mangalathayil A. Abdu, Jonas R. Souza, Inez S. Batista, and José H. A. Sobral
      Ann. Geophys., 35, 1219-1229, https://doi.org/10.5194/angeo-35-1219-2017, 2017
      This paper analyzes the influence of the recent deep and prolonged solar minimum on the daytime zonal and vertical plasma drift velocities during quiet time over Jicamarca, Peru. Our results show that an anomalously low zonal wind was mainly responsible for the observed anomalous behavior in the zonal drift followed by a decrease in the E-region conductivity and the dynamo electric field during 2008.
      PubDate: 2017-11-10T09:28:31+01:00
       
  • Climatology and modeling of ionospheric scintillations and irregularity
           zonal drifts at the equatorial anomaly crest region

    • Abstract: Climatology and modeling of ionospheric scintillations and irregularity zonal drifts at the equatorial anomaly crest region
      Marcio T. A. H. Muella, Marcelo H. Duarte-Silva, Alison O. Moraes, Eurico R. de Paula, Luiz F. C. de Rezende, Lucilla Alfonsi, and Bruno J. Affonso
      Ann. Geophys., 35, 1201-1218, https://doi.org/10.5194/angeo-35-1201-2017, 2017
      In this study we analyzed ~ 17 years of GPS data from receivers installed in the observatory of Cachoeira Paulista, Brazil. We statistically analyzed the occurrence of GPS signal amplitude fluctuations caused by irregularities in the Earth's upper atmosphere. These signal fluctuations are known to provoke positional errors for GPS users. The results revealed that the secular variations in the Earth’s magnetic field are affecting the climatology of such GPS signal fluctuations.
      PubDate: 2017-11-08T09:28:31+01:00
       
  • Searching for the 27-day solar rotational cycle in lightning events
           recorded in old diaries in Kyoto from the 17th to 18th century

    • Abstract: Searching for the 27-day solar rotational cycle in lightning events recorded in old diaries in Kyoto from the 17th to 18th century
      Hiroko Miyahara, Yasuyuki Aono, and Ryuho Kataoka
      Ann. Geophys., 35, 1195-1200, https://doi.org/10.5194/angeo-35-1195-2017, 2017
      Solar activity and climate show correlations over a wide range of timescales. It is important to understand the behavior of the 27-day solar rotational period in lightning activities because it provides an opportunity to understand how the sun influences weather and climate. We analyzed lightning data extracted from diaries written in Kyoto, Japan from the mid-17th to the mid-18th century. Lightning shows the signal of the 27-day period; however, it disappeared during the Maunder Minimum.
      PubDate: 2017-11-03T13:30:41+01:00
       
  • Statistical analysis of the mesospheric inversion layers over two
           symmetrical tropical sites: Réunion (20.8° S, 55.5° E) and Mauna
           Loa (19.5° N, 155.6° W)

    • Abstract: Statistical analysis of the mesospheric inversion layers over two symmetrical tropical sites: Réunion (20.8° S, 55.5° E) and Mauna Loa (19.5° N, 155.6° W)
      Nelson Bègue, Nkanyiso Mbatha, Hassan Bencherif, René Tato Loua, Venkataraman Sivakumar, and Thierry Leblanc
      Ann. Geophys., 35, 1177-1194, https://doi.org/10.5194/angeo-35-1177-2017, 2017
      In this investigation a statistical analysis of the characteristics of mesospheric inversion layers (MILs) over tropical regions is presented. This study involves the analysis of 16 years of lidar observations recorded at Reunion (20.8° S, 55.5° E) and 21 years of lidar observations recorded at Mauna Loa (19.5° N, 155.6° W) together with SABER observations at these two locations. Results presented in this study confirm that SAO contributes to the formation of MILs over the tropical region.
      PubDate: 2017-11-02T13:30:41+01:00
       
  • Evidence of prompt penetration electric fields during HILDCAA events

    • Abstract: Evidence of prompt penetration electric fields during HILDCAA events
      Regia Pereira Silva, Jose Humberto Andrade Sobral, Daiki Koga, and Jonas Rodrigues Souza
      Ann. Geophys., 35, 1165-1176, https://doi.org/10.5194/angeo-35-1165-2017, 2017
      In this work the response of the Brazilian equatorial ionosphere is studied during three HILDCAA events that occurred in the year of 2006 using the digisonde data. Geomagnetic indices and interplanetary parameters were used to calculate a cross-correlation coefficient between the Ey and the hmF2. The results showed that the pumping action of particle precipitation into the auroral zone has moderately modified the equatorial hmF2, being more sensitive during PRE time.
      PubDate: 2017-10-27T09:28:30+02:00
       
  • Mesospheric OH layer altitude at midlatitudes: variability over the Sierra
           Nevada Observatory in Granada, Spain (37° N, 3° W)

    • Abstract: Mesospheric OH layer altitude at midlatitudes: variability over the Sierra Nevada Observatory in Granada, Spain (37° N, 3° W)
      Maya García-Comas, María José López-González, Francisco González-Galindo, José Luis de la Rosa, Manuel López-Puertas, Marianna G. Shepherd, and Gordon G. Shepherd
      Ann. Geophys., 35, 1151-1164, https://doi.org/10.5194/angeo-35-1151-2017, 2017
      Information on the mesospheric OH layer height is crucial for identifying sources of its variability and causes of discrepancies in measurements and models. Using space-based data, we inferred an empirical function for predicting the altitude of the layer at midlatitudes from ground-based measurements of OH intensity and temperature. By applying it to data at the Sierra Nevada Observatory, we found significant short-term variability in the layer altitude, mainly due to wave variability.
      PubDate: 2017-10-25T09:28:30+02:00
       
  • Plasma line observations from the EISCAT Svalbard Radar during the
           International Polar Year

    • Abstract: Plasma line observations from the EISCAT Svalbard Radar during the International Polar Year
      Nickolay Ivchenko, Nicola M. Schlatter, Hanna Dahlgren, Yasunobu Ogawa, Yuka Sato, and Ingemar Häggström
      Ann. Geophys., 35, 1143-1149, https://doi.org/10.5194/angeo-35-1143-2017, 2017
      Photo-electrons and secondary electrons from particle precipitation enhance the incoherent scatter plasma line to levels sufficient for detection. A plasma line gives an accurate measure of the electron density and can be used to estimate electron temperature. The occurrence of plasma line enhancements in the EISCAT Svalbard Radar data was investigated. During summer daytime hours the plasma line is detectable in up to 90 % of the data. In winter time the occurrence is a few percent.
      PubDate: 2017-10-24T09:28:30+02:00
       
  • 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
       
 
 
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