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  Subjects -> PHYSICS (Total: 802 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (21 journals)
    - NUCLEAR PHYSICS (50 journals)
    - OPTICS (86 journals)
    - PHYSICS (578 journals)
    - SOUND (25 journals)
    - THERMODYNAMICS (33 journals)

PHYSICS (578 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: 19)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Advanced Composite Materials     Hybrid Journal   (Followers: 65)
Advanced Functional Materials     Hybrid Journal   (Followers: 49)
Advanced Materials     Hybrid Journal   (Followers: 251)
Advanced Science Focus     Free   (Followers: 3)
Advanced Structural and Chemical Imaging     Open Access   (Followers: 2)
Advances in Condensed Matter Physics     Open Access   (Followers: 8)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Geophysics     Full-text available via subscription   (Followers: 6)
Advances in High Energy Physics     Open Access   (Followers: 20)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 18)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances In Physics     Hybrid Journal   (Followers: 19)
Advances in Physics : X     Open Access  
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Remote Sensing     Open Access   (Followers: 37)
AIP Advances     Open Access   (Followers: 8)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 3)
American Journal of Condensed Matter Physics     Open Access   (Followers: 4)
American Journal of Signal Processing     Open Access   (Followers: 10)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 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: 10)
Annual Review of Condensed Matter Physics     Full-text available via subscription  
Annual Review of Materials Research     Full-text available via subscription   (Followers: 5)
APL Materials     Open Access   (Followers: 12)
Applied Composite Materials     Hybrid Journal   (Followers: 47)
Applied Physics A     Hybrid Journal   (Followers: 7)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 33)
Applied Physics Research     Open Access   (Followers: 3)
Applied Physics Reviews     Hybrid Journal   (Followers: 9)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 22)
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  
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: 41)
Bulletin of the Atomic Scientists     Hybrid Journal   (Followers: 3)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (Followers: 1)
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal  
Caderno Brasileiro de Ensino de Física     Open Access  
Canadian Journal of Physics     Hybrid Journal   (Followers: 14)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 9)
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: 180)
Composites Part B : Engineering     Hybrid Journal   (Followers: 227)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 21)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 2)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Physics Communications     Hybrid Journal   (Followers: 6)
Contemporary Concepts of Condensed Matter Science     Full-text available via subscription  
Contemporary Physics     Hybrid Journal   (Followers: 26)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 7)
Cryogenics     Hybrid Journal   (Followers: 47)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 53)
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: 4)
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 19)
EJNMMI Physics     Open Access  
Electrospinning     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 40)
Energy Procedia     Open Access   (Followers: 2)
Engineering Failure Analysis     Hybrid Journal   (Followers: 66)
Engineering Fracture Mechanics     Hybrid Journal   (Followers: 22)
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: 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: 22)
Experimental Methods in the Physical Sciences     Full-text available via subscription  
Experimental Techniques     Hybrid Journal   (Followers: 56)
Exploration Geophysics     Hybrid Journal   (Followers: 4)
Few-Body Systems     Hybrid Journal  
Fire and Materials     Hybrid Journal   (Followers: 5)
Flexible Services and Manufacturing Journal     Hybrid Journal   (Followers: 1)
Fluctuation and Noise Letters     Hybrid Journal   (Followers: 1)
Fluid Dynamics     Hybrid Journal   (Followers: 13)
Fortschritte der Physik/Progress of Physics     Hybrid Journal  
Frontiers in Physics     Open Access   (Followers: 6)
Frontiers of Materials Science     Hybrid Journal   (Followers: 3)
Frontiers of Physics     Hybrid Journal   (Followers: 2)
Fusion Engineering and Design     Hybrid Journal   (Followers: 10)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 26)
Geografiska Annaler, Series A : Physical Geography     Hybrid Journal   (Followers: 3)
Geophysical Research Letters     Full-text available via subscription   (Followers: 109)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 135)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 4)
Global Journal of Physics     Open Access   (Followers: 2)
Granular Matter     Hybrid Journal   (Followers: 1)
Graphs and Combinatorics     Hybrid Journal   (Followers: 6)
Gravitation and Cosmology     Hybrid Journal   (Followers: 3)
Handbook of Geophysical Exploration: Seismic Exploration     Full-text available via subscription  
Handbook of Metal Physics     Full-text available via subscription  
Handbook of Surface Science     Full-text available via subscription   (Followers: 2)
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: 65)
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: 21)
Indian Journal of Pure & Applied Physics (IJPAP)     Open Access   (Followers: 39)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 35)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 38)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Infinite Dimensional Analysis, Quantum Probability and Related Topics     Hybrid Journal  
InfraMatics     Open Access  
Infrared Physics & Technology     Hybrid Journal   (Followers: 11)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 8)
Intermetallics     Hybrid Journal   (Followers: 22)
International Applied Mechanics     Hybrid Journal   (Followers: 3)
International Geophysics     Full-text available via subscription   (Followers: 3)
International Heat Treatment and Surface Engineering     Hybrid Journal   (Followers: 5)
International Journal for Computational Methods in Engineering Science and Mechanics     Hybrid Journal   (Followers: 11)
International Journal for Ion Mobility Spectrometry     Hybrid Journal   (Followers: 1)
International Journal for Simulation and Multidisciplinary Design Optimization     Open Access   (Followers: 4)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 32)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 23)
International Journal of Computational Materials Science and Surface Engineering     Hybrid Journal   (Followers: 6)
International Journal of Damage Mechanics     Hybrid Journal   (Followers: 5)
International Journal of Fatigue     Hybrid Journal   (Followers: 34)
International Journal of Fracture     Hybrid Journal   (Followers: 12)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 2)
International Journal of Geophysics     Open Access   (Followers: 5)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 34)
International Journal of Low Radiation     Hybrid Journal  
International Journal of Low-Carbon Technologies     Open Access   (Followers: 1)
International Journal of Mass Spectrometry     Hybrid Journal   (Followers: 17)
International Journal of Material Forming     Hybrid Journal   (Followers: 1)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 5)

        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]
  • Exceptionally strong summer-like zonal wind reversal in the upper
           mesosphere during winter 2015/16

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

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

    • Abstract: Mesospheric gravity wave momentum flux estimation using hybrid Doppler interferometry
      Andrew J. Spargo, Iain M. Reid, Andrew D. MacKinnon, and David A. Holdsworth
      Ann. Geophys., 35, 733-750, https://doi.org/10.5194/angeo-35-733-2017, 2017
      Measuring the momentum transport due to gravity waves in the 80–100 km region is important for improving our understanding of the middle atmosphere, but it is still difficult to do at useful spatial scales. Here, we measure it using a method that has not been applied to the problem before, involving Doppler analysis of radar beams from multiple directions. The results are pleasing, and we conclude that the measurements may also be able to be made using cheaper, single-beam radar systems.
      PubDate: 2017-06-12T13:56:45+02:00
       
  • Studying the variability in the diurnal and seasonal variations in GPS
           total electron content over Nigeria

    • Abstract: Studying the variability in the diurnal and seasonal variations in GPS total electron content over Nigeria
      Victor Adetayo Eyelade, Adekola Olajide Adewale, Andrew Ovie Akala, Olawale Segun Bolaji, and A. Babatunde Rabiu
      Ann. Geophys., 35, 701-710, https://doi.org/10.5194/angeo-35-701-2017, 2017
      The study examined the diurnal and seasonal variations in total electron content (TEC) over Nigeria. The derived GPS TEC across all the stations demonstrated consistent minimum diurnal variations during the pre-sunrise hours, increased with a sharp gradient during the sunrise period, attained a postnoon maximum at about 14:00 LT, and then fell to a minimum just before sunset. The seasonal variation depicted a semi-annual distribution with higher values around equinoxes than solstices.
      PubDate: 2017-06-06T11:05:50+02:00
       
  • Errors in wind resource and energy yield assessments based on the Weibull
           distribution

    • Abstract: Errors in wind resource and energy yield assessments based on the Weibull distribution
      Bénédicte Jourdier and Philippe Drobinski
      Ann. Geophys., 35, 691-700, https://doi.org/10.5194/angeo-35-691-2017, 2017
      Wind resource assessments often rely on models of wind-speed statistics using a Weibull distribution. This study shows how its use impacts the prediction of the wind energy content and the power output. Three methods for fitting the Weibull distribution are tested (maximum likelihood, moments and WAsP). The first two methods overestimate the production up to 5 %. The WAsP method always produces errors lower than 2 %. A Rayleigh–Rice distribution is also tested and shows even better skill.
      PubDate: 2017-05-31T11:05:50+02:00
       
  • Causal kinetic equation of non-equilibrium plasmas

    • Abstract: Causal kinetic equation of non-equilibrium plasmas
      Rudolf A. Treumann and Wolfgang Baumjohann
      Ann. Geophys., 35, 683-690, https://doi.org/10.5194/angeo-35-683-2017, 2017
      We extend the Klimontovich (1967) formulation of kinetic theory of the evolution of the microscopic phase space density to taking into account that the interaction between particles separated from each other at a distance is not instantaneous but requires the transport of information. This is done by reference to the retarded potentials. We derive the fundamental causal Liouville equation for the phase space density of a system composed of a very large number of charged particles.
      PubDate: 2017-05-24T11:05:50+02:00
       
  • Daytime ozone loss term in the mesopause region

    • Abstract: Daytime ozone loss term in the mesopause region
      Mikhail Y. Kulikov, Mikhail V. Belikovich, Mykhaylo Grygalashvyly, Gerd R. Sonnemann, Tatiana S. Ermakova, Anton A. Nechaev, and Alexander M. Feigin
      Ann. Geophys., 35, 677-682, https://doi.org/10.5194/angeo-35-677-2017, 2017
      For the retrieval of atomic oxygen via ozone observations in theextended mesopause region under sunlight conditions, two assumptions areused: first, the photochemical equilibrium of ozone and, second, that the ozonelosses are dominated by ozone's dissociation from solar UV radiation, silentlyignoring the O3 destruction by atomic hydrogen. We verify both by 3-Dmodeling. We found that ozone approaches photochemical equilibrium at75–100 km for daytime conditions. Hence, the first assumption is valid.However, the reaction of ozone with atomic hydrogen was found to be animportant loss process and should not be omitted in retrieving atomicoxygen.
      PubDate: 2017-05-23T11:05:50+02:00
       
  • Propagation of a whistler wave incident from above on the lower nighttime
           ionosphere

    • Abstract: Propagation of a whistler wave incident from above on the lower nighttime ionosphere
      Peter Bespalov and Vera Mizonova
      Ann. Geophys., 35, 671-675, https://doi.org/10.5194/angeo-35-671-2017, 2017
      The problems of reflection and transmission of a whistler wave incident in the nighttime ionosphere from above are considered. Numerical solutions of the wave equations for a typical condition of the lower ionosphere are found. The energy reflection coefficient and horizontal wave magnetic field on the ground surface are calculated. The obtained results are important for analysis of the ELF–VLF emission phenomena observed from both the satellites and the ground-based observatories.
      PubDate: 2017-05-22T11:05:50+02:00
       
  • Statistical survey of day-side magnetospheric current flow using Cluster
           observations: magnetopause

    • Abstract: Statistical survey of day-side magnetospheric current flow using Cluster observations: magnetopause
      Evelyn Liebert, Christian Nabert, Christopher Perschke, Karl-Heinz Fornaçon, and Karl-Heinz Glassmeier
      Ann. Geophys., 35, 645-657, https://doi.org/10.5194/angeo-35-645-2017, 2017
      We present a statistical survey of current magnitudes, directions and locations at the high-latitude day-side magnetopause using Cluster's multi-spacecraft data. Our results show that the magnetopause current flow directions match expectations based on existing models and simulations. Current magnitudes are in correspondence with former studies. In addition, we observe a varying location of the currents with respect to changes in the ambient plasma properties.
      PubDate: 2017-05-17T11:05:50+02:00
       
  • Contrast analysis between the trajectory of the planetary system and the
           periodicity of solar activity

    • Abstract: Contrast analysis between the trajectory of the planetary system and the periodicity of solar activity
      Wei Sun, Jian Wang, JinRu Chen, Ying Wang, GuangMing Yu, and XianHai Xu
      Ann. Geophys., 35, 659-669, https://doi.org/10.5194/angeo-35-659-2017, 2017
      In this study, the kinematic index of planet heliocentric longitude is created based on the orbital elements of planets in the solar system. Both the planet juncture index and heliocentric longitude are used to investigate the periodic planetary system movement around the mass center of the solar system. The kinematic index of planet heliocentric longitude represents the exact location of the barycenter of the planetary system relative to that of the solar system.
      PubDate: 2017-05-17T11:05:50+02:00
       
  • Minimum variance projection for direct measurements of power-law spectra
           in the wavenumber domain

    • Abstract: Minimum variance projection for direct measurements of power-law spectra in the wavenumber domain
      Yasuhito Narita, Yoshihiro Nishimura, and Tohru Hada
      Ann. Geophys., 35, 639-644, https://doi.org/10.5194/angeo-35-639-2017, 2017
      An algorithm is proposed to estimate the spectral index of the turbulence energy spectrum directly in the wavenumber domain using multiple-sensor-array data. In contrast to the conventional method using time series data and Fourier transform of the fluctuation energy onto the frequency domain, the proposed algorithm does not require the assumption of Taylor's frozen inflow hypothesis, enabling direct comparison of the spectra in the wavenumber domain with various theoretical predictions.
      PubDate: 2017-05-11T11:05:50+02:00
       
  • Geomagnetic activity and local time dependence of the distribution of
           ultra low-frequency wave power in azimuthal wavenumbers, m

    • Abstract: Geomagnetic activity and local time dependence of the distribution of ultra low-frequency wave power in azimuthal wavenumbers, m
      Theodore E. Sarris and Xinlin Li
      Ann. Geophys., 35, 629-638, https://doi.org/10.5194/angeo-35-629-2017, 2017
      In this paper we describe a novel way to approximate the decomposition of magnetospheric ultra low-frequency (ULF) wave power in key azimuthal wavenumbers m, which is a parameter describing the number of azimuthal wavelengths that fit within a particle drift orbit. This is a critical parameter that is required in estimates of the rates of radial diffusion, and we show for the first time that there is a local time and geomagnetic activity dependence in the distribution of power in wavenumbers m.
      PubDate: 2017-05-10T11:05:50+02:00
       
  • Estimating a planetary magnetic field with time-dependent global MHD
           simulations using an adjoint approach

    • Abstract: Estimating a planetary magnetic field with time-dependent global MHD simulations using an adjoint approach
      Christian Nabert, Carsten Othmer, and Karl-Heinz Glassmeier
      Ann. Geophys., 35, 613-628, https://doi.org/10.5194/angeo-35-613-2017, 2017
      The interaction of the solar wind with a planetary magnetic field causes electrical currents that modify the magnetic field distribution around the planet. We present an approach to estimating the planetary magnetic field contribution by minimizing the misfit between simulation results and in situ spacecraft data. The approach is developed with respect to the upcoming BepiColombo mission to Mercury aimed at determining the planet's magnetic field.
      PubDate: 2017-05-09T11:05:50+02:00
       
  • Determinations of ionosphere and plasmasphere electron content for an
           African chain of GPS stations

    • Abstract: Determinations of ionosphere and plasmasphere electron content for an African chain of GPS stations
      Andrew J. Mazzella Jr., John Bosco Habarulema, and Endawoke Yizengaw
      Ann. Geophys., 35, 599-612, https://doi.org/10.5194/angeo-35-599-2017, 2017
      This investigation analyzes a chain of GPS stations in Africa in order to separate the ionosphere and plasmasphere contributions to the electron content, providing continuous temporal and latitudinal profiles during a single day. Comparisons to other GPS data analyses are also presented, indicating the influence of the plasmasphere on the determination of latitudinal variations and absolute levels, by inducing overestimates of biases. This investigation provides a basis for daily monitoring.
      PubDate: 2017-05-03T11:05:50+02:00
       
  • Seismo-ionospheric anomalies in ionospheric TEC and plasma density before
           the 17 July 2006 M7.7 south of Java earthquake

    • Abstract: Seismo-ionospheric anomalies in ionospheric TEC and plasma density before the 17 July 2006 M7.7 south of Java earthquake
      Dan Tao, Jinbin Cao, Roberto Battiston, Liuyuan Li, Yuduan Ma, Wenlong Liu, Zeren Zhima, Lanwei Wang, and Malcolm Wray Dunlop
      Ann. Geophys., 35, 589-598, https://doi.org/10.5194/angeo-35-589-2017, 2017
      We report significant evidence for pre-seismic ionospheric anomalies in total electron content (TEC) of a global ionosphere map (GIM) and plasma density and temperature appearing on day 2 before the 17 July 2006 M7.7 south of Java earthquake. The LTT spatial analysis also reveals a new feature: the TECs on epicenter side anomalously decrease and lead to an anomalous asymmetric structure with respect to the magnetic equator starting from day 2 before and disappearing after the earthquake.
      PubDate: 2017-04-25T11:05:50+02:00
       
  • Solar 27-day rotational period detected in wide-area lightning activity in
           Japan

    • Abstract: Solar 27-day rotational period detected in wide-area lightning activity in Japan
      Hiroko Miyahara, Chika Higuchi, Toshio Terasawa, Ryuho Kataoka, Mitsuteru Sato, and Yukihiro Takahashi
      Ann. Geophys., 35, 583-588, https://doi.org/10.5194/angeo-35-583-2017, 2017
      Detailed analyses of the 27-day solar rotational period in cloud and lightning activities may help in untangling the process of solar influence on weather and climate. We analyzed the lightning data in Japan for AD 1989–2015 and found that the 27-day solar rotational period is seen in wide-area lightning activity. The signal was stronger at the maxima of solar decadal cycles. It was also found that the signal of the 27-day period migrates from the southwest to the northeast in Japan.
      PubDate: 2017-04-24T11:05:50+02:00
       
  • Seasonal MLT-region nightglow intensities, temperatures, and emission
           heights at a Southern Hemisphere midlatitude site

    • Abstract: Seasonal MLT-region nightglow intensities, temperatures, and emission heights at a Southern Hemisphere midlatitude site
      Iain M. Reid, Andrew J. Spargo, Jonathan M. Woithe, Andrew R. Klekociuk, Joel P. Younger, and Gulamabas G. Sivjee
      Ann. Geophys., 35, 567-582, https://doi.org/10.5194/angeo-35-567-2017, 2017
      We measured temperatures in the atmosphere at heights near 90 km using nightglow emissions and compared them with satellite measurements and with measurements made with a meteor radar. We found good agreement between the techniques, which improved when we used the meteor radar and satellite data to measure densities at two heights separated by about 10 km to estimate the nightglow emission height.
      PubDate: 2017-04-18T11:05:50+02:00
       
  • Spatial and temporal variability in MLT turbulence inferred from in situ
           

    • Abstract: Spatial and temporal variability in MLT turbulence inferred from in situ and ground-based observations during the WADIS-1 sounding rocket campaign
      Boris Strelnikov, Artur Szewczyk, Irina Strelnikova, Ralph Latteck, Gerd Baumgarten, Franz-Josef Lübken, Markus Rapp, Stefanos Fasoulas, Stefan Löhle, Martin Eberhart, Ulf-Peter Hoppe, Tim Dunker, Martin Friedrich, Jonas Hedin, Mikhail Khaplanov, Jörg Gumbel, and Aroh Barjatya
      Ann. Geophys., 35, 547-565, https://doi.org/10.5194/angeo-35-547-2017, 2017
      The WADIS sounding rocket mission utilized multi-point turbulence measurements in the mesosphere by different techniques, i.e., with ionization gauges carried by rockets and ground-based MAARSY and EISCAT radars. Results show that turbulence energy dissipation rates oscillate in space and time with amplitude of up to 2 orders of magnitude. Spatial oscillations show the same wavelengths as atmospheric gravity waves. Temporal variability reveals periods of atmospheric tides and gravity waves.
      PubDate: 2017-04-10T11:05:50+02:00
       
  • Longitudinal variation of equatorial electrojet and the occurrence of its
           counter electrojet

    • Abstract: Longitudinal variation of equatorial electrojet and the occurrence of its counter electrojet
      A. Babatunde Rabiu, Olanike Olufunmilayo Folarin, Teiji Uozumi, Nurul Shazana Abdul Hamid, and Akimasa Yoshikawa
      Ann. Geophys., 35, 535-545, https://doi.org/10.5194/angeo-35-535-2017, 2017
      This work examined the longitudinal variability of the equatorial electrojet (EEJ) and the occurrence of its counter electrojet (CEJ) using the available records of the horizontal component H of the geomagnetic field simultaneously recorded in the year 2009 along the magnetic equator in South American, African, and Philippine sectors. Our results indicate that the EEJ and CEJ undergo longitudinal variability. More ground observation data points are required in the African equatorial zone.
      PubDate: 2017-04-07T11:05:50+02:00
       
  • Longitudinal, seasonal and solar cycle variation in lunar tide influence
           on the equatorial electrojet

    • Abstract: Longitudinal, seasonal and solar cycle variation in lunar tide influence on the equatorial electrojet
      Endawoke Yizengaw and Brett A. Carter
      Ann. Geophys., 35, 525-533, https://doi.org/10.5194/angeo-35-525-2017, 2017
      The lunar tide influence on the equatorial electrojet (EEJ) gets intensified around noon, primarily during new and full Moon periods. However, the longitudinal, seasonal and solar cycle variability in the lunar tide’s influence on ionospheric current systems is not well understood yet. In order to investigate this, 17 years (1998–2014) of extensive magnetometer observations at four longitudinal sectors (western American, western and eastern African, and Asian) have been analyzed.
      PubDate: 2017-04-05T11:05:50+02:00
       
 
 
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