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  Subjects -> PHYSICS (Total: 798 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (19 journals)
    - NUCLEAR PHYSICS (49 journals)
    - OPTICS (85 journals)
    - PHYSICS (581 journals)
    - SOUND (23 journals)
    - THERMODYNAMICS (32 journals)

PHYSICS (581 journals)                  1 2 3 | Last

Showing 1 - 200 of 741 Journals sorted alphabetically
Acta Acustica united with Acustica     Full-text available via subscription   (Followers: 6)
Acta Mechanica     Hybrid Journal   (Followers: 18)
Acta Scientifica Naturalis     Open Access   (Followers: 1)
Advanced Composite Materials     Hybrid Journal   (Followers: 60)
Advanced Functional Materials     Hybrid Journal   (Followers: 44)
Advanced Materials     Hybrid Journal   (Followers: 220)
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: 21)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 16)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances In Physics     Hybrid Journal   (Followers: 18)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Physics: X     Open Access  
Advances in Remote Sensing     Open Access   (Followers: 34)
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: 4)
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: 3)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
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: 10)
Applied Composite Materials     Hybrid Journal   (Followers: 44)
Applied Physics A     Hybrid Journal   (Followers: 8)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 33)
Applied Physics Research     Open Access   (Followers: 4)
Applied Physics Reviews     Hybrid Journal   (Followers: 9)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 6)
Applied Remote Sensing Journal     Open Access   (Followers: 33)
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  
Astronomy & Geophysics     Hybrid Journal   (Followers: 48)
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 20)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 6)
Atoms     Open Access  
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 9)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Axioms     Open Access  
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 2)
Berkala Fisika Indonesia     Open Access  
Biomaterials     Hybrid Journal   (Followers: 43)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 30)
Biophysical Reviews     Hybrid Journal  
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: 9)
Bulletin of Materials Science     Open Access   (Followers: 41)
Bulletin of the Atomic Scientists     Full-text available via subscription   (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     Full-text available via subscription   (Followers: 14)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 8)
Cells     Open Access   (Followers: 1)
CERN courier. International journal of high energy physics     Free   (Followers: 6)
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  
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: 2)
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 161)
Composites Part B : Engineering     Hybrid Journal   (Followers: 209)
Computational Astrophysics and Cosmology     Open Access  
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 21)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 1)
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: 27)
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: 6)
Cryogenics     Hybrid Journal   (Followers: 44)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 44)
Diagnostic and Interventional Imaging     Full-text available via subscription  
Diamond and Related Materials     Hybrid Journal   (Followers: 11)
Doklady Physics     Hybrid Journal   (Followers: 1)
Dynamical Properties of Solids     Full-text available via subscription  
ECS Journal of Solid State Science and Technology     Full-text available via subscription   (Followers: 3)
EDUSAINS     Open Access  
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: 38)
Energy Procedia     Open Access   (Followers: 2)
Engineering Failure Analysis     Hybrid Journal   (Followers: 64)
Engineering Fracture Mechanics     Hybrid Journal   (Followers: 22)
Environmental Fluid Mechanics     Hybrid Journal   (Followers: 3)
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: 19)
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: 21)
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: 10)
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: 25)
Geografiska Annaler, Series A: Physical Geography     Hybrid Journal   (Followers: 3)
Geophysical Research Letters     Full-text available via subscription   (Followers: 103)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 118)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 3)
Global Journal of Physics     Open Access   (Followers: 1)
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: 2)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 3)
Heat Transfer - Asian Research     Hybrid Journal   (Followers: 9)
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: 20)
IEEE Signal Processing Magazine     Full-text available via subscription   (Followers: 59)
IET Optoelectronics     Hybrid Journal   (Followers: 1)
Il Colle di Galileo     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: 36)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 35)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 27)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 6)
Infinite Dimensional Analysis, Quantum Probability and Related Topics     Hybrid Journal  
InfraMatics     Open Access  
Infrared Physics & Technology     Hybrid Journal   (Followers: 10)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 8)
Intermetallics     Hybrid Journal   (Followers: 21)
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: 3)
International Journal for Computational Methods in Engineering Science and Mechanics     Hybrid Journal   (Followers: 10)
International Journal for Ion Mobility Spectrometry     Hybrid Journal   (Followers: 1)
International Journal for Simulation and Multidisciplinary Design Optimization     Open Access   (Followers: 2)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Full-text available via subscription   (Followers: 27)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 21)
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: 33)
International Journal of Fracture     Hybrid Journal   (Followers: 11)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 2)
International Journal of Geophysics     Open Access   (Followers: 5)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 31)
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  

        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 European Geosciences Union Homepage  [8 journals]
  • Spatial and temporal variation of total electron content as revealed by
           principal component analysis

    • Abstract: Spatial and temporal variation of total electron content as revealed by principal component analysis
      Elsayed R. Talaat and Xun Zhu
      Ann. Geophys., 34, 1109-1117, doi:10.5194/angeo-34-1109-2016, 2016
      Global total electron content data derived from the assimilated thermosphere–ionosphere model are analyzed using empirical orthogonal function (EOF) decomposition and the principal component analysis technique. The spectral analysis of the time series of the EOF coefficients reveals how different mechanisms such as solar flux variation, change in the orbital declination, nonlinear mode coupling and geomagnetic activity are separated and expressed in different EOFs.
      PubDate: 2016-11-29T06:55:33+01:00
       
  • Deduction of the rates of radial diffusion of protons from the structure
           of the Earth's radiation belts

    • Abstract: Deduction of the rates of radial diffusion of protons from the structure of the Earth's radiation belts
      Alexander S. Kovtyukh
      Ann. Geophys., 34, 1085-1098, doi:10.5194/angeo-34-1085-2016, 2016
      From the data on the protons of the Earth’s radiation belts, the rate of radial diffusion of these particles is directly calculated. This is done by solving the systems of equations which describe the balance of radial transport/acceleration and ionization losses of protons. These results are very consistent with the radial diffusion of particles under the influence of the electric field pulsations in the range of the drift frequencies of the protons around Earth.
      PubDate: 2016-11-23T06:55:33+01:00
       
  • Mirror mode waves in Venus's magnetosheath: solar minimum vs. solar
           maximum

    • Abstract: Mirror mode waves in Venus's magnetosheath: solar minimum vs. solar maximum
      Martin Volwerk, Daniel Schmid, Bruce T. Tsurutani, Magda Delva, Ferdinand Plaschke, Yasuhito Narita, Tielong Zhang, and Karl-Heinz Glassmeier
      Ann. Geophys., 34, 1099-1108, doi:10.5194/angeo-34-1099-2016, 2016
      The behaviour of mirror mode waves in Venus's magnetosheath is investigated for solar minimum and maximum conditions. It is shown that the total observational rate of these waves does not change much; however, the distribution over the magnetosheath is significantly different, as well as the growth and decay of the waves during these different solar activity conditions.
      PubDate: 2016-11-23T06:55:33+01:00
       
  • Identification of the different magnetic field contributions during a
           geomagnetic storm in magnetospheric and ground observations

    • Abstract: Identification of the different magnetic field contributions during a geomagnetic storm in magnetospheric and ground observations
      Tommaso Alberti, Mirko Piersanti, Antonio Vecchio, Paola De Michelis, Fabio Lepreti, Vincenzo Carbone, and Leonardo Primavera
      Ann. Geophys., 34, 1069-1084, doi:10.5194/angeo-34-1069-2016, 2016
      We investigate the time variation of the magnetospheric and Earth's magnetic field during both quiet and disturbed periods. We identify the timescale variations associated with different magnetospheric current systems, solar-wind–magnetosphere high-frequency interactions, ionospheric processes, and internal dynamics of the magnetosphere. In addition, we propose a new local index for the identification of the intensity of a geomagnetic storm on the ground.
      PubDate: 2016-11-22T10:44:29+01:00
       
  • Latitudinal and longitudinal dependence of the cosmic ray diurnal
           anisotropy during 2001–2014

    • Abstract: Latitudinal and longitudinal dependence of the cosmic ray diurnal anisotropy during 2001–2014
      Anastasia Tezari, Helen Mavromichalaki, Dimitrios Katsinis, Anastasios Kanellakopoulos, Sofia Kolovi, Christina Plainaki, and Maria Andriopoulou
      Ann. Geophys., 34, 1053-1068, doi:10.5194/angeo-34-1053-2016, 2016
      The diurnal anisotropy of cosmic ray intensity for the timeperiod 2001 to 2014 is studied, covering the maximum and the descending phaseof solar cycle 23, the minimum between solar cycles 23 and 24, and theascending phase and maximum of solar cycle 24. Cosmic ray intensitydata from 11 neutron monitor stations located at different places around theNorthern Hemisphere obtained from the high-resolution Neutron MonitorDatabase (NMDB) were used. Special software was developed for the calculationsof the amplitude and the phase of the diurnal anisotropy vectors on annualand monthly basis using Fourier analysis and for the creation of the harmonicdial diagrams. The geomagnetic bending for each station was taken intoaccount in our calculations determined from the asymptotic cones of eachstation via the Tsyganenko96 (Tsyganenko and Stern, 1996) magnetospheric model. From our analysis, it wasresulted that there is a different behavior of the diurnal anisotropy vectorsduring the different phases of the solar cycles depending on the solarmagnetic field polarity. The latitudinal and longitudinal distribution of thecosmic ray diurnal anisotropy was also examined by grouping the stationsaccording to their geographic coordinates, and it was shown that diurnalvariation is modulated not only by the latitude but also by the longitude ofthe stations. The diurnal anisotropy during strong events of solar and/orcosmic ray activity is discussed.
      PubDate: 2016-11-21T10:44:29+01:00
       
  • Analysis of aerosol absorption properties and transport over North Africa
           and the Middle East using AERONET data

    • Abstract: Analysis of aerosol absorption properties and transport over North Africa and the Middle East using AERONET data
      Ashraf Farahat, Hesham El-Askary, Peter Adetokunbo, and Abu-Tharr Fuad
      Ann. Geophys., 34, 1031-1044, doi:10.5194/angeo-34-1031-2016, 2016
      The Middle East capitals are subjected to numerous dust storms along with local emissions and/or those transported from biomass burning or industrial activities. A combination of these aerosols results in poor air quality and poses significant health hazards. We investigated the transport of aerosols and their impact on the air quality using different parameters derived from the AERONET ground observations.
      PubDate: 2016-11-17T10:44:29+01:00
       
  • GPS network observation of traveling ionospheric disturbances following
           the Chelyabinsk meteorite blast

    • Abstract: GPS network observation of traveling ionospheric disturbances following the Chelyabinsk meteorite blast
      Feng Ding, Tian Mao, Lianhuan Hu, Baiqi Ning, Weixing Wan, and Yungang Wang
      Ann. Geophys., 34, 1045-1051, doi:10.5194/angeo-34-1045-2016, 2016
      Two traveling ionospheric disturbances (TIDs) were observed by the GPS network in Asia following the large meteorite blast over Chelyabinsk, Russia. No TIDs propagating in a global range were found. Features of TIDs were compared with those excited by early nuclear explosion tests. It is inferred from our analysis that the energy release of the Chelyabinsk meteorite blast may not be large enough to excite such ionospheric disturbances in a global range as some nuclear explosions have done.
      PubDate: 2016-11-17T10:44:29+01:00
       
  • Plasma fluctuations at the flanks of the Earth's magnetosheath at ion
           kinetic scales

    • Abstract: Plasma fluctuations at the flanks of the Earth's magnetosheath at ion kinetic scales
      Liudmila Rakhmanova, Maria Riazantseva, and Georgy Zastenker
      Ann. Geophys., 34, 1011-1018, doi:10.5194/angeo-34-1011-2016, 2016
      We present a statistical study of the magnetosheath plasma fluctuationspectra at a high-frequency range (with frequencies from 0.01 to 10 Hz).Variations of ion flux value and its direction are considered. The directionof ion flux is characterized by a polar angle – the deviation of the ionflux vector from the Sun–Earth line. We consider 290 Fourier's spectra thatcan be described by two power laws with a break, i.e., a change of slope. Theion flux fluctuation spectra are shown to have breaks at higher frequenciescompared to the polar angle spectra. We compare the frequency of the breakwith the gyrostructure frequency for a number of cases. We show the polarangle break frequency to usually be smaller than the gyrostructure frequency.The dependencies of spectrum parameters such as the slopes and the breakfrequency on plasma parameters are also considered.
      PubDate: 2016-11-16T10:44:29+01:00
       
  • Electrodynamic influence on the diurnal behaviour of neutral daytime
           airglow emissions

    • Abstract: Electrodynamic influence on the diurnal behaviour of neutral daytime airglow emissions
      Deepak K. Karan, Duggirala Pallamraju, Kedar A. Phadke, Tatiparti Vijayalakshmi, Tarun K. Pant, and Shyamoli Mukherjee
      Ann. Geophys., 34, 1019-1030, doi:10.5194/angeo-34-1019-2016, 2016
      Dayglow emission variability is expected to show a symmetric solar zenith-angle-dependent diurnal pattern as the production mechanisms are dominated by solar flux; however, this is not always the case. Our investigation reveals an imprint of equatorial electrodynamics on the neutral dayglow emission variability, as opposed to that of the solar zenith angle. This has implications in gaining a comprehensive understanding of the coupled nature of the ion-neutral behaviour in the upper atmosphere.
      PubDate: 2016-11-16T10:44:29+01:00
       
  • Ionospheric tomography by gradient-enhanced kriging with STEC measurements
           and ionosonde characteristics

    • Abstract: Ionospheric tomography by gradient-enhanced kriging with STEC measurements and ionosonde characteristics
      David Minkwitz, Karl Gerald van den Boogaart, Tatjana Gerzen, Mainul Hoque, and Manuel Hernández-Pajares
      Ann. Geophys., 34, 999-1010, doi:10.5194/angeo-34-999-2016, 2016
      We extend the kriging of the ionospheric electron density with slant total electron content (STEC) measurements based on a spatial covariance to kriging with a spatial–temporal covariance and develop a novel tomography approach by gradient-enhanced kriging assimilating STEC and F2 layer characteristics. The methods are cross-validated with independent measurements and point out the potential compensation for the often observed bias in the estimation of the F2 layer peak height.
      PubDate: 2016-11-14T12:27:20+01:00
       
  • Multipoint spacecraft observations of long-lasting poloidal Pc4 pulsations
           in the dayside magnetosphere on 1–2 May 2014

    • Abstract: Multipoint spacecraft observations of long-lasting poloidal Pc4 pulsations in the dayside magnetosphere on 1–2 May 2014
      Galina Korotova, David Sibeck, Mark Engebretson, John Wygant, Scott Thaller, Harlan Spence, Craig Kletzing, Vassilis Angelopoulos, and Robert Redmon
      Ann. Geophys., 34, 985-998, doi:10.5194/angeo-34-985-2016, 2016
      We use magnetic field and plasma observations from the Van Allen Probes,Time History of Events and Macroscale Interactions during Substorms (THEMIS) and Geostationary Operational Environmental Satellite system (GOES) spacecraft to study the spatial and temporal characteristicsof long-lasting poloidal Pc4 pulsations in the dayside magnetosphere. Thepulsations were observed after the main phase of a moderate storm during lowgeomagnetic activity. The pulsations occurred during various interplanetaryconditions and the solar wind parameters do not seem to control theoccurrence of the pulsations. The most striking feature of the Pc4 magneticfield pulsations was their occurrence at similar locations during three offour successive orbits. We used this information to study the latitudinalnodal structure of the pulsations and demonstrated that the latitudinalextent of the magnetic field pulsations did not exceed 2 Earth radii(RE). A phase shift between the azimuthal and radial components of theelectric and magnetic fields was observed from ZSM  =  0.30 RE to ZSM  =  −0.16 RE. We used magnetic and electric field data from Van AllenProbes to determine the structure of ULF waves. We showed that the Pc4magnetic field pulsations were radially polarized and are the second-mode harmonic waves. We suggest that the spacecraft were near a magnetic fieldnull during the second orbit when they failed to observe the magnetic fieldpulsations at the local times where pulsations were observed on previous andsuccessive orbits. We investigated the spectral structure of the Pc4pulsations. Each spacecraft observed a decrease of the dominant period as itmoved to a smaller L shell (stronger magnetic field strength). We demonstratedthat higher frequencies occurred at times and locations where Alfvénvelocities were greater, i.e., on Orbit 1. There is some evidence that theperiods of the pulsations increased during the plasmasphere refillingfollowing the storm.
      PubDate: 2016-11-14T12:27:20+01:00
       
  • On the role of ion-scale whistler waves in space and astrophysical plasma
           turbulence

    • Abstract: On the role of ion-scale whistler waves in space and astrophysical plasma turbulence
      Horia Comişel, Yasuhiro Nariyuki, Yasuhito Narita, and Uwe Motschmann
      Ann. Geophys., 34, 975-984, doi:10.5194/angeo-34-975-2016, 2016
      Competition of linear mode waves is studied numerically tounderstand the energy cascade mechanism in plasma turbulence on ion-kineticscales. Hybrid plasma simulations are performed in a 3-D simulationbox by pumping large-scale Alfvén waves on the fluid scale. The result iscompared with that from our earlier 2-D simulations. We find that thewhistler mode is persistently present both in the 2-D and 3-Dsimulations irrespective of the initial setup, e.g., the amplitude of theinitial pumping waves, while all the other modes are excited and damped suchthat the energy is efficiently transported to thermal energy overnon-whistler mode. The simulation results suggest that the whistler modecould transfer the fluctuation energy smoothly from the fluid scale down tothe electron-kinetic scale, and justifies the notion of whistlerturbulence.
      PubDate: 2016-11-09T12:27:20+01:00
       
  • Seasonal variations and north–south asymmetries in polar wind outflow
           due to solar illumination

    • Abstract: Seasonal variations and north–south asymmetries in polar wind outflow due to solar illumination
      Lukas Maes, Romain Maggiolo, and Johan De Keyser
      Ann. Geophys., 34, 961-974, doi:10.5194/angeo-34-961-2016, 2016
      Ion outflow from the ionospheric regions at the highest latitudes is mainly driven by solar illumination. It is an important factor affecting atmospheric escape and space weather. But this region rotates into and out of the sunlight on a daily and seasonal basis. This creates daily and seasonal variations in the outflow, even with both hemispheres combined. The north–south asymmetry in Earth's magnetic field causes extra variations and asymmetries. This was studied with a simple empirical model.
      PubDate: 2016-11-07T14:01:28+01:00
       
  • Evidence for transient, local ion foreshocks caused by dayside
           magnetopause reconnection

    • Abstract: Evidence for transient, local ion foreshocks caused by dayside magnetopause reconnection
      Yann Pfau-Kempf, Heli Hietala, Steve E. Milan, Liisa Juusola, Sanni Hoilijoki, Urs Ganse, Sebastian von Alfthan, and Minna Palmroth
      Ann. Geophys., 34, 943-959, doi:10.5194/angeo-34-943-2016, 2016
      We have simulated the interaction of the solar wind – the charged particles and magnetic fields emitted by the Sun into space – with the magnetic field of the Earth. The solar wind flows supersonically and creates a shock when it encounters the obstacle formed by the geomagnetic field. We have identified a new chain of events which causes phenomena in the downstream region to eventually cause perturbations at the shock and even upstream. This is confirmed by ground and satellite observations.
      PubDate: 2016-11-04T14:01:28+01:00
       
  • Observational evidence for new instabilities in the midlatitude E and F
           region

    • Abstract: Observational evidence for new instabilities in the midlatitude E and F region
      David L. Hysell, Miguel Larsen, and Michael Sulzer
      Ann. Geophys., 34, 927-941, doi:10.5194/angeo-34-927-2016, 2016
      Radar observations of the E- and F-region ionosphere from the Arecibo Observatory made during moderately disturbed conditions are presented. Plasma irregularities in both ionospheric regions were observed. We investigate the role of neutral atmospheric dynamics and instabilities in causing the ionospheric disturbances. A number of viable instability mechanisms rooted in neutral dynamics are identified.
      PubDate: 2016-11-03T14:01:28+01:00
       
  • Proton and heavy ion acceleration by stochastic fluctuations in the
           Earth's magnetotail

    • Abstract: Proton and heavy ion acceleration by stochastic fluctuations in the Earth's magnetotail
      Filomena Catapano, Gaetano Zimbardo, Silvia Perri, Antonella Greco, and Anton V. Artemyev
      Ann. Geophys., 34, 917-926, doi:10.5194/angeo-34-917-2016, 2016
      Spacecraft observations show that energetic ions are found in the Earth’s magnetotail, with energies ranging from tens of keV to a few hundreds of keV. In this paper we carry out test particle simulations in which protons and other ion species are injected in the Vlasov magnetic field configurations obtained by Catapano et al. (2015). Three-dimensional time-dependent stochastic electromagnetic perturbations are included in the simulation box, so that the ion acceleration process is studied.
      PubDate: 2016-10-25T14:01:28+02:00
       
  • Filamentary field-aligned currents at the polar cap region
           during northward interplanetary magnetic field derived with the
           Swarm constellation

    • Abstract: Filamentary field-aligned currents at the polar cap region duringnorthward interplanetary magnetic field derived with the Swarmconstellation
      Hermann Lühr, Tao Huang, Simon Wing, Guram Kervalishvili, Jan Rauberg, and Haje Korth
      Ann. Geophys., 34, 901-915, doi:10.5194/angeo-34-901-2016, 2016
      ESA's constellation mission Swarm makes it possible for the first time to determine field-aligned currents (FACs) reliably in the ionosphere. FACs are able to transport energy from the solar wind to the Earth and heat the upper atmosphere. Here we investigate FAC structures that have been missed by previous satellite missions. Most of them are found poleward of the northern light zone. The energy sources seem to be located on the nightside of Earth about 100 000 km away.
      PubDate: 2016-10-24T14:01:28+02:00
       
  • Can the comprehensive model phase 4 (CM4) predict the geomagnetic diurnal
           field for days away from quiet time?

    • Abstract: Can the comprehensive model phase 4 (CM4) predict the geomagnetic diurnal field for days away from quiet time?
      Elvis Onovughe
      Ann. Geophys., 34, 887-900, doi:10.5194/angeo-34-887-2016, 2016
      We assess the CM4 of daily variation and whether it can be applied to times and activity levels outside of those that provide input data for the model. Our conclusion shows that the model works well at times outside those from which CM4 was produced and also performs better than expected at activity levels higher than that for which CM4 was designed, although it fails to predict short-period behaviour.
      PubDate: 2016-10-18T14:01:28+02:00
       
  • Influence of Indian summer monsoon variability on the surface waves in
           the coastal regions of eastern Arabian Sea

    • Abstract: Influence of Indian summer monsoon variability on the surface waves in thecoastal regions of eastern Arabian Sea
      V. Sanil Kumar and Jesbin George
      Ann. Geophys., 34, 871-885, doi:10.5194/angeo-34-871-2016, 2016
      Influence of monsoon variability on the surface waves using measured data covering 7 years and reanalysis data from 1979 to 2015 during the Indian summer monsoon in the eastern Arabian Sea is examined. A high positive correlation (r ~ 0.84) between average low-level jet for the block 0–15° N, 50–75° E and wave height of eastern Arabian Sea is observed in all months except August. The monsoon seasonal average wave height is found to be relatively low during the strong El Niño years.
      PubDate: 2016-10-18T14:01:28+02:00
       
  • Large-scale coordinated observations of Pc5 pulsation events

    • Abstract: Large-scale coordinated observations of Pc5 pulsationevents
      Zolile Mtumela, Anthony D. M. Walker, Judy A. E. Stephenson, and Michael J. Kosch
      Ann. Geophys., 34, 857-870, doi:10.5194/angeo-34-857-2016, 2016
      Pc5 pulsations are global magnetohydrodynamic events in the magnetosphere. This article details the analysis of Pc5 pulsation events observed by SuperDARN high-frequency radars within their field of view together with magnetometers. We believe that despite much theoretical knowledge, very few pulsation events observed by multiple radars have been reported in the literature to determine in detail the physical characteristics of Pc5 pulsation events by direct observation.
      PubDate: 2016-09-29T14:01:28+02:00
       
 
 
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