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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: 45)
Advanced Materials     Hybrid Journal   (Followers: 223)
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 : X     Open Access  
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Remote Sensing     Open Access   (Followers: 34)
AIP Advances     Open Access   (Followers: 9)
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: 46)
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: 44)
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: 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: 162)
Composites Part B : Engineering     Hybrid Journal   (Followers: 206)
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: 45)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 46)
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: 39)
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: 100)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 118)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 4)
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: 61)
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: 38)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 35)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 28)
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: 3)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Hybrid Journal   (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: 15)
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]
  • Scintillation measurements at Bahir Dar during the high solar activity
           phase of solar cycle 24

    • Abstract: Scintillation measurements at Bahir Dar during the high solar activity phase of solar cycle 24
      Martin Kriegel, Norbert Jakowski, Jens Berdermann, Hiroatsu Sato, and Mogese Wassaie Mersha
      Ann. Geophys., 35, 97-106, doi:10.5194/angeo-35-97-2017, 2017
      Small-scale ionospheric disturbances may cause severe radio scintillations ofsignals transmitted from global navigation satellite systems (GNSSs).Consequently, small-scale plasma irregularities may heavily degrade theperformance of current GNSSs such as GPS, GLONASS or Galileo. This paperpresents analysis results obtained primarily from two high-rate GNSS receiverstations designed and operated by the German Aerospace Center (DLR) incooperation with Bahir Dar University (BDU) at 11.6° N,37.4° E. Both receivers collect raw data sampled at up to 50 Hz, fromwhich characteristic scintillation parameters such as the S4 index arededuced.
      This paper gives a first overview of the measurement set-up and the observedscintillation events over Bahir Dar in 2015. Both stations are located closeto one another and aligned in an east–west, direction which allows us toestimate the zonal drift velocity and spatial dimension of equatorialionospheric plasma irregularities. Therefore, the lag times of movingelectron density irregularities and scintillation patterns are derived byapplying cross-correlation analysis to high-rate measurements of the slanttotal electron content (sTEC) along radio links between a GPS satellite andboth receivers and to the associated signal power,respectively. Finally, the drift velocity is derived from the estimated lagtime, taking into account the geometric constellation of both receivingantennas and the observed GPS satellites.
      PubDate: 2017-01-13T15:25:39+01:00
       
  • Vertical wavenumber spectra of three-dimensional winds revealed by
           radiosonde observations at midlatitude

    • Abstract: Vertical wavenumber spectra of three-dimensional winds revealed by radiosonde observations at midlatitude
      Shao Dong Zhang, Chun Ming Huang, Kai Ming Huang, Ye Hui Zhang, Yun Gong, and Quan Gan
      Ann. Geophys., 35, 107-116, doi:10.5194/angeo-35-107-2017, 2017
      We present the first statistical results of vertical wind fluctuation spectra, which revealed a very shallow spectral structure, with mean slopes of −0.58 and −0.23 in the troposphere and lower stratosphere, respectively. No existing spectral theories can comprehensively explain the observed three-dimensional wind spectra, indicating that the spectral features of atmospheric fluctuations are far from fully understood.
      PubDate: 2017-01-13T15:25:39+01:00
       
  • An improved troposphere tomographic approach considering the signals
           coming from the side face of the tomographic area

    • Abstract: An improved troposphere tomographic approach considering the signals coming from the side face of the tomographic area
      Qingzhi Zhao and Yibin Yao
      Ann. Geophys., 35, 87-95, doi:10.5194/angeo-35-87-2017, 2017
      A troposphere tomographic method has been proposed considering the signal rays penetrating from the side of the area of interest. Given the method above needs the establishment of a unit scale factor model using the radiosonde data at only one location in the research area, an improved approach is proposed by considering the reasonability of modelling data and the diversity of the modelling parameters for building a more accurate unit scale factor model.
      PubDate: 2017-01-11T15:25:39+01:00
       
  • Ground-based acoustic parametric generator impact on the atmosphere and
           ionosphere in an active experiment

    • Abstract: Ground-based acoustic parametric generator impact on the atmosphere and ionosphere in an active experiment
      Yuriy G. Rapoport, Oleg K. Cheremnykh, Volodymyr V. Koshovy, Mykola O. Melnik, Oleh L. Ivantyshyn, Roman T. Nogach, Yuriy A. Selivanov, Vladimir V. Grimalsky, Valentyn P. Mezentsev, Larysa M. Karataeva, Vasyl. M. Ivchenko, Gennadi P. Milinevsky, Viktor N. Fedun, and Eugen N. Tkachenko
      Ann. Geophys., 35, 53-70, doi:10.5194/angeo-35-53-2017, 2017
      Before many catastrophic phenomena such as earthquakes, sound is generated at a very low frequency. It is already established that it can disturb the upper layer of the atmosphere – the ionosphere. Control of disasters' precursors is important. Using the unique, powerful sound generator, whose loudness is comparable to an ascending jet, we have constructed the theory and conducted a series of experiments trying to model acoustic action of disasters on the ionosphere.
      PubDate: 2017-01-05T14:44:46+01:00
       
  • Absence of the strahl during times of slow wind

    • Abstract: Absence of the strahl during times of slow wind
      Chris Gurgiolo and Melvyn L. Goldstein
      Ann. Geophys., 35, 71-85, doi:10.5194/angeo-35-71-2017, 2017
      Observations during periods when the solar wind has a speed
      PubDate: 2017-01-05T14:44:46+01:00
       
  • Induction effects of geomagnetic disturbances in the geo-electric field
           variations at low latitudes

    • Abstract: Induction effects of geomagnetic disturbances in the geo-electric field variations at low latitudes
      Vafi Doumbia, Kouadio Boka, Nguessan Kouassi, Oswald Didier Franck Grodji, Christine Amory-Mazaudier, and Michel Menvielle
      Ann. Geophys., 35, 39-51, doi:10.5194/angeo-35-39-2017, 2017
      The electrical inductions within the Earth surface due to geomagnetic field variations were examined. For that purpose the records of the geomagnetic and geo-electric field variations observed in West Africa were used. We have found that the geomagnetic field brisk variations induce non-negligible geo-electric field variations at low latitudes. This result implies a possible intense geomagnetically induced current flow in the vicinity of the equatorial electrojet influence area.
      PubDate: 2017-01-04T14:44:46+01:00
       
  • Signature of ionospheric irregularities under different geophysical
           

    • Abstract: Signature of ionospheric irregularities under different geophysical conditions on SBAS performance in the western African low-latitude region
      Oladipo Emmanuel Abe, Xurxo Otero Villamide, Claudia Paparini, Rodrigue Herbert Ngaya, Sandro M. Radicella, and Bruno Nava
      Ann. Geophys., 35, 1-9, doi:10.5194/angeo-35-1-2017, 2017
      Rate of change of TEC (ROT) and its index (ROTI) are considered agood proxy to characterize the occurrence of ionospheric plasmairregularities like those observed after sunset at low latitudes. SBASs(satellite-based augmentation systems) are civil aviation systems thatprovide wide-area or regional improvement to single-frequency satellitenavigation using GNSS (Global Navigation Satellite System) constellations.Plasma irregularities in the path of the GNSS signal after sunset causesevere phase fluctuations and loss of locks of the signals in GNSS receiverat low-latitude regions. ROTI is used in this paper to characterize plasmadensity ionospheric irregularities in central–western Africa under nominaland disturbed conditions and identified some days of irregularityinhibition. A specific low-latitude algorithm is used to emulate potentialpossible SBAS message using real GNSS data in the western African low-latituderegion. The performance of a possible SBAS operation in the region underdifferent ionospheric conditions is analysed. These conditions includeeffects of geomagnetic disturbed periods when SBAS performance appears to beenhanced due to ionospheric irregularity inhibition. The results of thispaper could contribute to a feasibility assessment of a European Geostationary Navigation Overlay System-based SBAS inthe sub-Saharan African region.
      PubDate: 2017-01-03T14:44:46+01:00
       
  • On the response of quasi-adiabatic particles to magnetotail
           reconfigurations

    • Abstract: On the response of quasi-adiabatic particles to magnetotail reconfigurations
      Dominique C. Delcourt, Helmi V. Malova, and Lev M. Zelenyi
      Ann. Geophys., 35, 11-23, doi:10.5194/angeo-35-11-2017, 2017
      In a magnetic field reversal, the guiding center may not be valid due to large variation of the magnetic field on the length scale of the particle gyro-radius. Although they do not execute regular helical motion and temporarily meander inside the field reversal, quasi-adiabatic particles exit this reversal with a magnetic moment nearly identical to that at entry. We show that this behavior, which is a steady-state concept, can persist during dipolarization despite the induced electric field.
      PubDate: 2017-01-03T14:44:46+01:00
       
  • Measurements of the total ozone column using a Brewer spectrophotometer
           and TOMS and OMI satellite instruments over the Southern Space Observatory
           in Brazil

    • Abstract: Measurements of the total ozone column using a Brewer spectrophotometer and TOMS and OMI satellite instruments over the Southern Space Observatory in Brazil
      Lucas Vaz Peres, Hassan Bencherif, Nkanyiso Mbatha, André Passaglia Schuch, Abdoulwahab Mohamed Toihir, Nelson Bègue, Thierry Portafaix, Vagner Anabor, Damaris Kirsch Pinheiro, Neusa Maria Paes Leme, José Valentin Bageston, and Nelson Jorge Schuch
      Ann. Geophys., 35, 25-37, doi:10.5194/angeo-35-25-2017, 2017
      In this paper, we analyze the total ozone column over the Southern Space Observatory, Brazil, between 1992 and 2014 by Brewer spectrometer and TOMS and OMI satellite instruments, finding good agreement between the two. In addition, the seasonal TOC variation is dominated by an annual cycle, and the Quasi-Biennial Oscillation modulation was the main mode of interannual variability and in opposite phase to the total ozone column anomaly time series.
      PubDate: 2017-01-03T14:44:46+01:00
       
  • The story of plumes: the development of a new conceptual framework for
           understanding magnetosphere and ionosphere coupling

    • Abstract: The story of plumes: the development of a new conceptual framework for understanding magnetosphere and ionosphere coupling
      Mark B. Moldwin, Shasha Zou, and Tom Heine
      Ann. Geophys., 34, 1243-1253, doi:10.5194/angeo-34-1243-2016, 2016
      A significant number of studies published over the last 15 years demonstrate that there is strong two-way coupling between the magnetosphere and ionosphere during geomagnetic activity; not only does the ionosphere respond to magnetospheric forcing during storms, but through its impact on wave generation, wave-particle interactions, ion outflow and mass loading at the dayside magnetopause and in the magnetotail, dense plasma plumes modulate the subsequent magnetospheric dynamics.
      PubDate: 2016-12-21T09:25:20+01:00
       
  • Patches of polar mesospheric summer echoes characterized from radar
           imaging observations with MAARSY

    • Abstract: Patches of polar mesospheric summer echoes characterized from radar imaging observations with MAARSY
      Svenja Sommer and Jorge L. Chau
      Ann. Geophys., 34, 1231-1241, doi:10.5194/angeo-34-1231-2016, 2016
      Radar echoes from mesospheric altitudes (80–90 km) are called polar mesospheric summer echoes (PMSEs). These echoes can be used to derive wind velocities and turbulence strength estimations in a region where measurements are hard to perform. The small-scale structure of PMSEs has not been analysed before but, as we will show, has a major influence on wind and turbulence measurements. We also present a method to improve these measurements by using software beam-steering methods.
      PubDate: 2016-12-19T09:25:20+01:00
       
  • Stability of solar correction for calculating ionospheric trends

    • Abstract: Stability of solar correction for calculating ionospheric trends
      Jan Laštovička, Dalia Burešová, Daniel Kouba, and Peter Križan
      Ann. Geophys., 34, 1191-1196, doi:10.5194/angeo-34-1191-2016, 2016
      Global climate change affects the whole atmosphere, including the thermosphere and ionosphere. Calculations of long-term trends in the ionosphere are critically dependent on solar activity correction of ionospheric input data. The main result of this study is the finding that the solar activity correction used in calculating ionospheric long-term trends is not stable, as was assumed in all previous investigations of ionospheric trends.
      PubDate: 2016-12-16T09:25:20+01:00
       
  • Spatial and temporal variations of wave energy in the nearshore waters of
           the central west coast of India

    • Abstract: Spatial and temporal variations of wave energy in the nearshore waters of the central west coast of India
      M. M. Amrutha and V. Sanil Kumar
      Ann. Geophys., 34, 1197-1208, doi:10.5194/angeo-34-1197-2016, 2016
      This study examines variation in wave power off the central west coast of India at water depths 30, 9 and 5 m based on buoy measured data. The study shows a significant reduction (~ 10–27 %) in wave power at 9 m depth compared to 30 m and the power at 5 m depth is 20–23 % less than that at 9 m. At 9 m water depth, the mean annual wave power is 6 kW m−1 and interannual variations up to 19.3 % are observed during 2009–2014; 75 % of the total annual wave energy is from this narrow directional sector.
      PubDate: 2016-12-16T09:25:20+01:00
       
  • Derivation of turbulent energy dissipation rate with the Middle Atmosphere
           Alomar Radar System (MAARSY) and radiosondes at Andøya, Norway

    • Abstract: Derivation of turbulent energy dissipation rate with the Middle Atmosphere Alomar Radar System (MAARSY) and radiosondes at Andøya, Norway
      Qiang Li, Markus Rapp, Anne Schrön, Andreas Schneider, and Gunter Stober
      Ann. Geophys., 34, 1209-1229, doi:10.5194/angeo-34-1209-2016, 2016
      Turbulence is an essential process in the atmosphere and ocean. Clear-air turbulence is a well-known threat for the safety of aviation. Using a powerful MST radar, we detected turbulence and compared it with the results from radiosondes. The correlation between turbulence and background conditions, e.g., Richardson number and wind shears, is determined. There is a nearly negative correlation between turbulence and Richardson number independent of the length scale over which it was calculated.
      PubDate: 2016-12-16T09:25:20+01:00
       
  • Observations of diffusion in the electron halo and strahl

    • Abstract: Observations of diffusion in the electron halo and strahl
      Chris Gurgiolo and Melvyn L. Goldstein
      Ann. Geophys., 34, 1175-1189, doi:10.5194/angeo-34-1175-2016, 2016
      Using Cluster data we have noted observations of diffusion-like signatures in the energy range where the the solar wind halo and strahl populations overlap. This includes the development of a proto-halo. At present the source of this diffusion is not known or understood. The prime analysis was carried out through the use of phi–theta plots at individual energy steps. The motivation was to understand if repartitioning in energy was occurring at these locations.
      PubDate: 2016-12-15T09:25:20+01:00
       
  • Euler potentials for two layers with non-constant current densities in the
           ambient magnetic field aligned to the layers

    • Abstract: Euler potentials for two layers with non-constant current densities in the ambient magnetic field aligned to the layers
      Marek Vandas and Eugene P. Romashets
      Ann. Geophys., 34, 1165-1173, doi:10.5194/angeo-34-1165-2016, 2016
      Magnetic field and motion of charged particles are examined near two parallel current sheets with non-uniformly distributed currents theoretically. Results can be applied to study of Birkeland currents which flow in the ionosphere along magnetic field lines and are connected to auroral phenomena.
      PubDate: 2016-12-13T09:25:20+01:00
       
  • Spectral analysis of auroral geomagnetic activity during various solar
           cycles between 1960 and 2014

    • Abstract: Spectral analysis of auroral geomagnetic activity during various solar cycles between 1960 and 2014
      Pieter Benjamin Kotzé
      Ann. Geophys., 34, 1159-1164, doi:10.5194/angeo-34-1159-2016, 2016
      We use wavelets and Lomb–Scargle spectral analysis techniques to investigate the changing pattern of the different harmonics of the 27-day solar rotation period of the AE index during various phases of different solar cycles between 1960 and 2014. Results show that, particularly during the solar minimum of 23–24 in 2008, the 27-day period is no longer detectable above the 95 % CI, while auroral geomagnetic activity is now dominated by the second (13.5-day) and third (9.0-day) harmonics.
      PubDate: 2016-12-06T08:43:20+01:00
       
  • Modeling anisotropic Maxwell–Jüttner distributions: derivation
           and properties

    • Abstract: Modeling anisotropic Maxwell–Jüttner distributions: derivation and properties
      George Livadiotis
      Ann. Geophys., 34, 1145-1158, doi:10.5194/angeo-34-1145-2016, 2016
      The paper develops a consistent model for the anisotropic Maxwell–Jüttner distribution. This is the velocity distribution in a gas of relativistic particles, where the temperature is not equi-distributed in all degrees of freedom. The physical requirements necessary for modeling this distribution are provided. The known models are examined showing that they do not fulfill these requirements, while a new model is constructed and studied that is consistent with all the required conditions.
      PubDate: 2016-12-02T08:43:20+01:00
       
  • Decay times of transitionally dense specularly reflecting meteor trails
           and potential chemical impact on trail lifetimes

    • Abstract: Decay times of transitionally dense specularly reflecting meteor trails and potential chemical impact on trail lifetimes
      Wayne K. Hocking, Reynold E. Silber, John M. C. Plane, Wuhu Feng, and Marcial Garbanzo-Salas
      Ann. Geophys., 34, 1119-1144, doi:10.5194/angeo-34-1119-2016, 2016
      Meteoroids entering the atmosphere produce trails of ionized particles which can be detected with radar. The weakest ones are called underdense (the most common), the strongest are called overdense, and intermediate ones are transitional. Meteor radar signatures are used to determine atmospheric parameters like temperature and winds. We present new results which show the effect of ozone on the transitional trail lifetimes, which may eventually allow radar to measure mesospheric ozone.
      PubDate: 2016-12-02T08:43:20+01:00
       
  • 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
       
 
 
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