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  Subjects -> PHYSICS (Total: 800 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (21 journals)
    - NUCLEAR PHYSICS (49 journals)
    - OPTICS (86 journals)
    - PHYSICS (578 journals)
    - SOUND (25 journals)
    - THERMODYNAMICS (32 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: 18)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Advanced Composite Materials     Hybrid Journal   (Followers: 63)
Advanced Functional Materials     Hybrid Journal   (Followers: 48)
Advanced Materials     Hybrid Journal   (Followers: 244)
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: 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: 18)
Advances in Physics : X     Open Access  
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Remote Sensing     Open Access   (Followers: 35)
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: 6)
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: 45)
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 Remote Sensing Journal     Open Access   (Followers: 34)
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: 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: 44)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
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: 42)
Bulletin of the Atomic Scientists     Hybrid Journal   (Followers: 3)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (Followers: 1)
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal  
Caderno Brasileiro de Ensino de Física     Open Access  
Canadian Journal of Physics     Full-text available via subscription   (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  
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: 177)
Composites Part B : Engineering     Hybrid Journal   (Followers: 225)
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: 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: 46)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 48)
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     Hybrid Journal   (Followers: 4)
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: 40)
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: 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: 105)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 130)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 4)
Global Journal of Physics     Open Access   (Followers: 2)
Granular Matter     Hybrid Journal   (Followers: 1)
Graphs and Combinatorics     Hybrid Journal   (Followers: 6)
Gravitation and Cosmology     Hybrid Journal   (Followers: 3)
Handbook of Geophysical Exploration: Seismic Exploration     Full-text available via subscription  
Handbook of Metal Physics     Full-text available via subscription  
Handbook of Surface Science     Full-text available via subscription   (Followers: 3)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription   (Followers: 1)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 3)
Heat Transfer - Asian Research     Hybrid Journal   (Followers: 11)
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: 62)
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: 35)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 7)
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: 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: 3)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 31)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 22)
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: 32)
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)

        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]
  • 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, doi: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: 2017-04-18T12:15:00+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, doi: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: 2017-04-10T11:17:57+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, doi: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: 2017-04-07T11:17:57+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, doi: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: 2017-04-05T08:46:33+02:00
       
  • Variations in energy, flux, and brightness of pulsating aurora measured at
           high time resolution

    • Abstract: Variations in energy, flux, and brightness of pulsating aurora measured at high time resolution
      Hanna Dahlgren, Betty S. Lanchester, Nickolay Ivchenko, and Daniel K. Whiter
      Ann. Geophys., 35, 493-503, doi:10.5194/angeo-35-493-2017, 2017
      Pulsating aurora are ubiquitous events that constitute a large amount of energy transfer to the ionosphere. Still there are unsolved issues regarding their formation. Using high-resolution optical and radar data, we find that it is the flux of high-energy electrons that get reduced during the OFF period of the pulsations. We also report on dips in brightness at the transition between ON and OFF, and asymmetric rise and fall times, which may have implications for understanding the pulsations.
      PubDate: 2017-03-28T15:19:56+02:00
       
  • Magnetic reconnection during steady magnetospheric convection and other
           magnetospheric modes

    • Abstract: Magnetic reconnection during steady magnetospheric convection and other magnetospheric modes
      Benoit Hubert, Jean-Claude Gérard, Steve E. Milan, and Stanley W. H. Cowley
      Ann. Geophys., 35, 505-524, doi:10.5194/angeo-35-505-2017, 2017
      Remote sensing of the polar aurora and ionospheric convection is used to characterize the interaction between the solar wind and the Earth magnetosphere during steady magnetospheric convection (SMC) intervals and compare them with other previously studied geomagnetic conditions. It is found that the Earth magnetosphere may exhibit four different coupling modes ordered by increasing open magnetic flux and magnetic reconnection rate: quiet times, SMC, substorm and sawtooth events.
      PubDate: 2017-03-28T15:19:56+02:00
       
  • Effect of water vapour absorption on hydroxyl temperatures measured from
           Svalbard

    • Abstract: Effect of water vapour absorption on hydroxyl temperatures measured from Svalbard
      Joshua M. Chadney, Daniel K. Whiter, and Betty S. Lanchester
      Ann. Geophys., 35, 481-491, doi:10.5194/angeo-35-481-2017, 2017
      A layer of excited OH molecules in the upper atmosphere produces strong airglow emission from which it is possible to obtain the temperature of the layer. To obtain accurate temperatures values, one must take into account the absorption of OH emission by water vapour in the lower atmosphere before this emission is measured by instruments on the ground. This paper provides the amount of absorption suffered by each OH line due to water vapour and presents a method to estimate water concentrations.
      PubDate: 2017-03-24T15:19:56+01:00
       
  • Estimation of a planetary magnetic field using a reduced
           magnetohydrodynamic model

    • Abstract: Estimation of a planetary magnetic field using a reduced magnetohydrodynamic model
      Christian Nabert, Daniel Heyner, and Karl-Heinz Glassmeier
      Ann. Geophys., 35, 465-474, doi:10.5194/angeo-35-465-2017, 2017
      Knowledge of planetary magnetic fields provides deep insights into the structure and dynamics of planets. Due to the interaction of a planet with the solar wind plasma, electrical currents are generated which modify the planetary magnetic field outside the planet. New methods are presented to estimate the planetary magnetic field contribution from spacecraft observations. A reduced model of the interaction relates the time-varying observations to the planetary magnetic field magnitude.
      PubDate: 2017-03-22T15:19:56+01:00
       
  • Relation of anomalous F region radar echoes in the high-latitude
           ionosphere to auroral precipitation

    • Abstract: Relation of anomalous F region radar echoes in the high-latitude ionosphere to auroral precipitation
      Hanna Dahlgren, Nicola M. Schlatter, Nickolay Ivchenko, Lorenz Roth, and Alexander Karlsson
      Ann. Geophys., 35, 475-479, doi:10.5194/angeo-35-475-2017, 2017
      Anomalous strong echoes with three frequency peaks are occasionally seen with incoherent scatter radars in the ionosphere near 200 km altitude at high latitudes. We investigate how they relate to electron precipitation, by finding the resulting peak electron density and the height of the peak, respectively. We find that occurrence rate increases with density and decreases with height, indicating a correlation between the echoes and precipitating electrons with high energy and energy flux.
      PubDate: 2017-03-22T15:19:56+01:00
       
  • Diurnal variations in integrated water vapor derived from a GPS ground
           network in the Volga–Ural region of Russia

    • Abstract: Diurnal variations in integrated water vapor derived from a GPS ground network in the Volga–Ural region of Russia
      Vladislav V. Kalinnikov and Olga G. Khutorova
      Ann. Geophys., 35, 453-464, doi:10.5194/angeo-35-453-2017, 2017
      Here, we present estimates of diurnal and semidiurnal harmonics of variations in integrated water vapor content (IWV) according to GPS data in the Volga–Ural region during 2013–2015. Comparison of diurnal cycle from GPS data and ERA-Interim reanalysis has revealed significant differences in the phase. It is found that, as a result of evaporation from underlying surface and convective lifting of moist air, the summer diurnal variations in IWV and surface density of water vapor are in antiphase.
      PubDate: 2017-03-21T22:36:52+01:00
       
  • Comparisons between high-resolution profiles of squared refractive index
           gradient M2 measured by the Middle and Upper Atmosphere Radar and unmanned
           aerial vehicles (UAVs) during the Shigaraki UAV-Radar Experiment 2015
           campaign

    • Abstract: Comparisons between high-resolution profiles of squared refractive index gradient M2 measured by the Middle and Upper Atmosphere Radar and unmanned aerial vehicles (UAVs) during the Shigaraki UAV-Radar Experiment 2015 campaign
      Hubert Luce, Lakshmi Kantha, Hiroyuki Hashiguchi, Dale Lawrence, Masanori Yabuki, Toshitaka Tsuda, and Tyler Mixa
      Ann. Geophys., 35, 423-441, doi:10.5194/angeo-35-423-2017, 2017
      Results of comparisons between data collected from a VHF Doppler radar and small unmanned aerial vehicles (UAVs) are presented. The UAVs, equipped with meteorological sensors, flew nearby the radar up to an altitude of ~ 4.0 km. Both instruments detected the same clear-air refractive index gradients at a vertical scale of ~ 20 m when the vertical stratification was strong. A VHF radar can thus provide a faithful image of the vertical stratification of the atmosphere down to decimeter scales.
      PubDate: 2017-03-17T22:36:52+01:00
       
  • THEMIS satellite observations of hot flow anomalies at Earth's bow shock

    • Abstract: THEMIS satellite observations of hot flow anomalies at Earth's bow shock
      Christina Chu, Hui Zhang, David Sibeck, Antonius Otto, QiuGang Zong, Nick Omidi, James P. McFadden, Dennis Fruehauff, and Vassilis Angelopoulos
      Ann. Geophys., 35, 443-451, doi:10.5194/angeo-35-443-2017, 2017
      Hot flow anomalies (HFAs) at Earth's bow shock were identified in Time History of Events and Macroscale Interactions During Substorms (THEMIS) satellite data from 2007 to 2009. The events were classified as young or mature and regular or spontaneous hot flow anomalies (SHFAs). HFA–SHFA occurrence decreases with distance upstream from the bow shock. HFAs are more prevalent for radial interplanetary magnetic fields and solar wind speeds from 550 to 600 kms−1.
      PubDate: 2017-03-17T22:36:52+01:00
       
  • Rocket in situ observation of equatorial plasma irregularities in the
           region between E and F layers over Brazil

    • Abstract: Rocket in situ observation of equatorial plasma irregularities in the region between E and F layers over Brazil
      Siomel Savio Odriozola, Francisco Carlos de Meneses Jr., Polinaya Muralikrishna, Alexandre Alvares Pimenta, and Esfhan Alam Kherani
      Ann. Geophys., 35, 413-422, doi:10.5194/angeo-35-413-2017, 2017
      In this paper we report several ionospheric plasma irregularities detected by an instrument (Langmuir probe) installed as a rocket payload that flew over the equatorial region of Brazil. The results of our measurements were compared with measurements made on a different date and by another instrument (radar) located under the magnetic equator in Peru. Our comparison suggests that the rocket intercepted the same type of irregularity previously detected in Peru.
      PubDate: 2017-03-16T09:27:55+01:00
       
  • High-order ionospheric effects on electron density estimation from
           Fengyun-3C GPS radio occultation

    • Abstract: High-order ionospheric effects on electron density estimation from Fengyun-3C GPS radio occultation
      Junhai Li and Shuanggen Jin
      Ann. Geophys., 35, 403-411, doi:10.5194/angeo-35-403-2017, 2017
      In this paper, we discuss the higher-order ionospheric effects on electron density estimation. We estimate the higher-order ionospheric effect carefully and obtain some conclusions. The results show that the second-order ionospheric effects cannot be ignored in precise ionospheric electron density estimation. The azimuth, the solar activity, and the occultation time and position are the main effect factors of the high-order ionospheric delay which we should consider.
      PubDate: 2017-03-15T09:27:55+01:00
       
  • High-resolution coherent backscatter interferometric radar images of
           equatorial spread F using Capon's method

    • Abstract: High-resolution coherent backscatter interferometric radar images of equatorial spread F using Capon's method
      Fabiano S. Rodrigues, Eurico R. de Paula, and Gebreab K. Zewdie
      Ann. Geophys., 35, 393-402, doi:10.5194/angeo-35-393-2017, 2017
      We present results of Capon's method for the estimation of in-beam images of equatorial spread F (ESF) irregularities observed by the São Luís radar interferometer. Results of numerical simulations show that, despite the short baselines of the system, the method is capable of distinguishing localized features with kilometric scale sizes (zonal direction). Results from the application of Capon’s method to actual measurements show that it is able to resolve features expected to occur in ESF.
      PubDate: 2017-03-14T09:27:55+01:00
       
  • MONITOR Ionospheric Network: two case studies on scintillation and
           electron content variability

    • Abstract: MONITOR Ionospheric Network: two case studies on scintillation and electron content variability
      Yannick Béniguel, Iurii Cherniak, Alberto Garcia-Rigo, Pierrick Hamel, Manuel Hernández-Pajares, Roland Kameni, Anton Kashcheyev, Andrzej Krankowski, Michel Monnerat, Bruno Nava, Herbert Ngaya, Raül Orus-Perez, Hughes Secrétan, Damien Sérant, Stefan Schlüter, and Volker Wilken
      Ann. Geophys., 35, 377-391, doi:10.5194/angeo-35-377-2017, 2017
      The work presented in this paper was done in the frame of an ESA activity. The aim of this project was to study ionosphere disturbances liable to impact navigation systems. This project has been running over several years, allowing enough data acquisition to gain sufficient knowledge of ionosphere variability. It was launched to support the European Satellite-Based Augmented System (EGNOS), also considering a possible extension of the system over Africa.
      PubDate: 2017-03-13T09:27:55+01:00
       
  • Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic
           and auroral luminosity pulsations in the polar cap

    • Abstract: Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap
      Nadezda Yagova, Natalia Nosikova, Lisa Baddeley, Olga Kozyreva, Dag A. Lorentzen, Vyacheslav Pilipenko, and Magnar G. Johnsen
      Ann. Geophys., 35, 365-376, doi:10.5194/angeo-35-365-2017, 2017
      A substorm is a dramatic phenomenon in the near-Earth space that is visualized as an aurora. Mostly substorms are caused by changes in the solar wind, but some of them can develop without any evident trigger. Such substorms together with undisturbed days were investigated using magnetometer and photometer data from Svalbard. Substorm precursors, i.e., specific features in 1–4 mHz geomagnetic and auroral luminosity pulsations, have been found at high geomagnetic latitudes.
      PubDate: 2017-03-08T09:27:55+01:00
       
  • Ionospheric response to magnetar flare: signature of SGR J1550–5418 on
           coherent ionospheric Doppler radar

    • Abstract: Ionospheric response to magnetar flare: signature of SGR J1550–5418 on coherent ionospheric Doppler radar
      Ayman Mahrous
      Ann. Geophys., 35, 345-351, doi:10.5194/angeo-35-345-2017, 2017
      This is the first time a traveling ionospheric disturbance caused by an extraterrestrial source like a magnetar has been detected. The source entered an active phase on 22 January 2009, during which a large number of bursts were observed by several satellites. We detected its ionospheric signature using the coherent ionospheric Doppler radar system. In general, the Earth's ionosphere is a gigantic detector that responds to the ionizing radiation emitted through high-energy astrophysical objects.
      PubDate: 2017-03-07T13:51:05+01:00
       
  • A comparison of ground-based hydroxyl airglow temperatures with
           SABER/TIMED measurements over 23° N, India

    • Abstract: A comparison of ground-based hydroxyl airglow temperatures with SABER/TIMED measurements over 23° N, India
      Navin Parihar, Dupinder Singh, and Subramanian Gurubaran
      Ann. Geophys., 35, 353-363, doi:10.5194/angeo-35-353-2017, 2017
      Using an all-sky imager, near-mesopause OH temperatures were derived from OH(6, 2) Meinel band intensity measurements. A limited comparison of OH temperatures with SABER/TIMED measurements performed by defining almost-coincident criteria of ±1.5° latitude–longitude and ±3 min indicated fair agreement between ground-based and SABER measurements in general. The difference of two measurements increased when the peak of the OH emission layer lay in the vicinity of large temperature inversions.
      PubDate: 2017-03-07T13:51:05+01:00
       
  • New results on equatorial thermospheric winds and temperatures from
           Ethiopia, Africa

    • Abstract: New results on equatorial thermospheric winds and temperatures from Ethiopia, Africa
      Fasil Tesema, Rafael Mesquita, John Meriwether, Baylie Damtie, Melessew Nigussie, Jonathan Makela, Daniel Fisher, Brian Harding, Endawoke Yizengaw, and Samuel Sanders
      Ann. Geophys., 35, 333-344, doi:10.5194/angeo-35-333-2017, 2017
      Measurements of equatorial thermospheric winds obtained from an optical instrument called a Fabry–Perot interferometer in Ethiopia show a significance difference as compared with other longitudinal sectors. The zonal wind in this sector is small and shows a gradual decrease through out the night. Application of climatological wind and temperature models shows good agreement with the observations over Ethiopia.
      PubDate: 2017-03-03T13:51:05+01:00
       
 
 
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