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  Subjects -> PHYSICS (Total: 820 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (22 journals)
    - NUCLEAR PHYSICS (52 journals)
    - OPTICS (89 journals)
    - PHYSICS (590 journals)
    - SOUND (25 journals)
    - THERMODYNAMICS (33 journals)

PHYSICS (590 journals)                  1 2 3 | Last

Showing 1 - 200 of 741 Journals sorted alphabetically
Acta Acustica united with Acustica     Full-text available via subscription   (Followers: 8)
Acta Mechanica     Hybrid Journal   (Followers: 21)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
Advanced Composite Materials     Hybrid Journal   (Followers: 71)
Advanced Functional Materials     Hybrid Journal   (Followers: 57)
Advanced Materials     Hybrid Journal   (Followers: 285)
Advanced Science Focus     Free   (Followers: 5)
Advanced Structural and Chemical Imaging     Open Access   (Followers: 2)
Advanced Studies in Theoretical Physics     Open Access  
Advances in Condensed Matter Physics     Open Access   (Followers: 10)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 1)
Advances in Geophysics     Full-text available via subscription   (Followers: 6)
Advances in High Energy Physics     Open Access   (Followers: 18)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 25)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances In Physics     Hybrid Journal   (Followers: 20)
Advances in Physics : X     Open Access  
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Remote Sensing     Open Access   (Followers: 44)
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: 11)
Anales (Asociación Física Argentina)     Open Access  
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 5)
Annalen der Physik     Hybrid Journal   (Followers: 5)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 19)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3)
Annales UMCS, Physica     Open Access  
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 4)
Annals of Physics     Hybrid Journal   (Followers: 4)
Annals of West University of Timisoara - Physics     Open Access   (Followers: 1)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 4)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 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: 13)
Applied Composite Materials     Hybrid Journal   (Followers: 49)
Applied Physics A     Hybrid Journal   (Followers: 9)
Applied Physics Frontier     Open Access   (Followers: 2)
Applied Physics Letters     Hybrid Journal   (Followers: 34)
Applied Physics Research     Open Access   (Followers: 5)
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: 3)
Archive for Rational Mechanics and Analysis     Hybrid Journal  
Asia Pacific Physics Newsletter     Hybrid Journal   (Followers: 1)
ASTRA Proceedings     Open Access   (Followers: 1)
Astronomy & Geophysics     Hybrid Journal   (Followers: 42)
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 22)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 9)
Atoms     Open Access   (Followers: 1)
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 12)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Axioms     Open Access   (Followers: 1)
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 2)
Berkala Fisika Indonesia     Open Access  
Biomaterials     Hybrid Journal   (Followers: 48)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 21)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 37)
Biophysical Reviews     Hybrid Journal   (Followers: 1)
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 3)
BMC Biophysics     Open Access   (Followers: 3)
Boson Journal of Modern Physics     Open Access   (Followers: 10)
Brazilian Journal of Physics     Hybrid Journal  
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Bulletin of Materials Science     Open Access   (Followers: 43)
Bulletin of the Atomic Scientists     Hybrid Journal   (Followers: 4)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (Followers: 1)
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal   (Followers: 2)
Caderno Brasileiro de Ensino de Física     Open Access  
Canadian Journal of Physics     Hybrid Journal   (Followers: 12)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 11)
Cells     Open Access   (Followers: 2)
CERN courier. International journal of high energy physics     Free   (Followers: 7)
Chemical Physics of Solid Surfaces     Full-text available via subscription  
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 14)
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 Computational Physics     Full-text available via subscription   (Followers: 2)
Communications in Mathematical Physics     Hybrid Journal   (Followers: 2)
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: 212)
Composites Part B : Engineering     Hybrid Journal   (Followers: 249)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 22)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 3)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Physics Communications     Hybrid Journal   (Followers: 7)
Condensed Matter     Open Access   (Followers: 1)
Contemporary Concepts of Condensed Matter Science     Full-text available via subscription  
Contemporary Physics     Hybrid Journal   (Followers: 26)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 4)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 8)
Cryogenics     Hybrid Journal   (Followers: 53)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 69)
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  
East European Journal of Physics     Open Access  
ECS Journal of Solid State Science and Technology     Hybrid Journal   (Followers: 6)
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: 46)
Energy Procedia     Open Access   (Followers: 2)
Engineering Failure Analysis     Hybrid Journal   (Followers: 67)
Engineering Fracture Mechanics     Hybrid Journal   (Followers: 24)
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   (Followers: 2)
European Journal of Physics     Full-text available via subscription   (Followers: 17)
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: 3)
Few-Body Systems     Hybrid Journal  
Fire and Materials     Hybrid Journal   (Followers: 5)
Flexible Services and Manufacturing Journal     Hybrid Journal   (Followers: 1)
Fluctuation and Noise Letters     Hybrid Journal   (Followers: 1)
Fluid Dynamics     Hybrid Journal   (Followers: 14)
Fortschritte der Physik/Progress of Physics     Hybrid Journal  
Frontiers in Physics     Open Access   (Followers: 6)
Frontiers of Materials Science     Hybrid Journal   (Followers: 4)
Frontiers of Physics     Hybrid Journal   (Followers: 2)
Fusion Engineering and Design     Hybrid Journal   (Followers: 10)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 30)
Geografiska Annaler, Series A : Physical Geography     Hybrid Journal   (Followers: 3)
Geophysical Research Letters     Full-text available via subscription   (Followers: 136)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 177)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 4)
Granular Matter     Hybrid Journal   (Followers: 1)
Graphs and Combinatorics     Hybrid Journal   (Followers: 7)
Gravitation and Cosmology     Hybrid Journal   (Followers: 3)
Handbook of Geophysical Exploration: Seismic Exploration     Full-text available via subscription  
Handbook of Metal Physics     Full-text available via subscription  
Handbook of Surface Science     Full-text available via subscription   (Followers: 4)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription   (Followers: 1)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 5)
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: 22)
IEEE Signal Processing Magazine     Full-text available via subscription   (Followers: 76)
IET Optoelectronics     Hybrid Journal   (Followers: 1)
Il Colle di Galileo     Open Access  
Image Analysis & Stereology     Open Access  
Imaging Science Journal     Hybrid Journal   (Followers: 3)
Indian Journal of Biochemistry and Biophysics (IJBB)     Open Access   (Followers: 2)
Indian Journal of Physics     Hybrid Journal   (Followers: 18)
Indian Journal of Pure & Applied Physics (IJPAP)     Open Access   (Followers: 37)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 47)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 45)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 16)
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: 12)
Intermetallics     Hybrid Journal   (Followers: 23)
International Applied Mechanics     Hybrid Journal   (Followers: 3)
International Geophysics     Full-text available via subscription   (Followers: 3)
International Heat Treatment and Surface Engineering     Hybrid Journal   (Followers: 4)
International Journal for Computational Methods in Engineering Science and Mechanics     Hybrid Journal   (Followers: 12)
International Journal for Ion Mobility Spectrometry     Hybrid Journal   (Followers: 1)
International Journal for Simulation and Multidisciplinary Design Optimization     Open Access   (Followers: 4)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 35)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 23)
International Journal of Computational Materials Science and Surface Engineering     Hybrid Journal   (Followers: 6)
International Journal of Damage Mechanics     Hybrid Journal   (Followers: 5)
International Journal of Fatigue     Hybrid Journal   (Followers: 38)
International Journal of Fracture     Hybrid Journal   (Followers: 13)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 1)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 35)
International Journal of Low Radiation     Hybrid Journal   (Followers: 1)
International Journal of Low-Carbon Technologies     Open Access   (Followers: 1)
International Journal of Mass Spectrometry     Hybrid Journal   (Followers: 17)

        1 2 3 | Last

Journal Cover Annales Geophysicae (ANGEO)
  [SJR: 1.105]   [H-I: 73]   [19 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 0992-7689 - ISSN (Online) 1432-0576
   Published by Copernicus Publications Homepage  [49 journals]
  • A critical note on the IAGA-endorsed Polar Cap (PC) indices: excessive
           excursions in the real-time index values

    • Abstract: A critical note on the IAGA-endorsed Polar Cap (PC) indices: excessive excursions in the real-time index values
      Peter Stauning
      Ann. Geophys., 36, 621-631, https://doi.org/10.5194/angeo-36-621-2018, 2018
      The Polar Cap (PC) indices, PCN (North) based on magnetic data from Qaanaaq (Thule) and PCS (South) based on Vostok data, reflect the transpolar convection of plasma and magnetic fields. The PC indices could be used, among others, to indicate the energy transfer from the solar wind to the magnetosphere–ionosphere–thermosphere system in space weather monitoring applications. The present IAGA-endorsed methods to derive PC indices in real time are found to generate inconsistent index values.
      PubDate: 2018-04-16T13:18:38+02:00
       
  • Estimating ocean tide model uncertainties for electromagnetic inversion
           studies

    • Abstract: Estimating ocean tide model uncertainties for electromagnetic inversion studies
      Jan Saynisch, Christopher Irrgang, and Maik Thomas
      Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2018-27,2018
      Manuscript under review for ANGEO (discussion: open, 0 comments)
      By induction, ocean tides generate electromagnetic signals. Since the launch of magnetometer satellite missions, these signals are used increasingly to infer electric properties of the Earth. In many of these inversions, ocean tide models are used to generate oceanic tidal electromagnetic signals via electromagnetic induction. The studies main goal is to provide tide model errors for the electromagnetic inversion studies.
      PubDate: 2018-04-13T13:18:38+02:00
       
  • Impact of disturbance electric fields in the evening on prereversal
           vertical drift and spread F developments in the equatorial ionosphere

    • Abstract: Impact of disturbance electric fields in the evening on prereversal vertical drift and spread F developments in the equatorial ionosphere
      Mangalathayil A. Abdu, Paulo A. B. Nogueira, Angela M. Santos, Jonas R. de Souza, Inez S. Batista, and Jose H. A. Sobral
      Ann. Geophys., 36, 609-620, https://doi.org/10.5194/angeo-36-609-2018, 2018
      Equatorial ionospheric irregularities have a significant detrimental impact on a variety of space application systems in navigation and communication areas that utilize satellites, especially the Global Navigation Satellite Systems (GNSS) network. The development of these irregularities in the nighttime ionosphere is controlled primarily by ionospheric electric fields and instabilities. The effect of magnetic disturbance on these electric fields and on the irregularities is investigated here.
      PubDate: 2018-04-09T13:18:38+02:00
       
  • An empirical model (CH-Therm-2018) of the thermospheric mass density
           derived from CHAMP

    • Abstract: An empirical model (CH-Therm-2018) of the thermospheric mass density derived from CHAMP
      Chao Xiong, Hermann Lühr, Michael Schmidt, Mathis Bloßfeld, and Sergei Rudenko
      Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2018-25,2018
      Manuscript under review for ANGEO (discussion: open, 0 comments)
      Thermospheric drag is the major non-gravitational perturbation acting on Low Earth Orbit (LEO) satellites at altitudes up to 1000 km. The drag depends on the thermospheric density, which is a key parameter in the planning of LEO missions, e.g. their lifetime, collision avoidance, precise orbit determination, as well as orbit and re-entry prediction. In this study, we present an empirical model, named CH-Therm-2018, of the thermospheric mass density derived from 9-year (from August 2000 to July 2009) accelerometer measurements at altitude from 460 to 310 km, from the CHAllenging Minisatellite Payload (CHAMP) satellite. The CHAMP dataset is divided into two 5-year periods with 1-year overlap (from August 2000 to July 2005 and from August 2004 to July 2009), to represent the high-to-moderate and moderate-to-low solar activity conditions, respectively. The CH-Therm-2018 model is a function of seven key parameters, including the height, solar flux index, season (day of year), magnetic local time, geographic latitude and longitude, as well as magnetic activity represented by the solar wind merging electric field. Predictions of the CH-Therm-2018 model agree well with the CHAMP observations (disagreements within ±20 %), and show different features of thermospheric mass density during solar activities, e.g. the March-September equinox asymmetry and the longitudinal wave pattern. We compare the CH-Therm-2018 predictions with the Naval Research Laboratory Mass Spectrometer Incoherent Scatter Radar Extended (NRLMSISE-00) model. The result shows that CH-Therm-2018 better predicts the density evolution during the last solar minimum (2008-2009) than the NRLMSISE-00 model. By comparing the Satellite Laser Ranging (SLR) observations of the ANDE-Pollux satellites during August-September 2009, we estimate 6-h scaling factors of thermospheric mass density and obtain a median value of 1.27 ± 0.60, indicating that our model, on average, slightly underestimates the thermospheric mass density at solar minimum.
      PubDate: 2018-04-06T13:18:38+02:00
       
  • On the short-term variability of turbulence and temperature in the winter
           mesosphere

    • Abstract: On the short-term variability of turbulence and temperature in the winter mesosphere
      Gerald A. Lehmacher, Miguel F. Larsen, Richard L. Collins, Aroh Barjatya, and Boris Strelnikov
      Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2018-30,2018
      Manuscript under review for ANGEO (discussion: open, 0 comments)
      We used sounding rockets to obtain 4 high-resolution profiles in the mesosphere over a limited area. We found consistent deep isothermal and adiabatic layers, but variable and finely structured turbulence preferentially in the lower stable mesosphere. Accompanying tracer releases showed horizontal winds in the lower thermosphere with extreme shears and 200 m/s winds under moderately disturbed geomagnetic conditions, and convective structures just below the mesopause.
      PubDate: 2018-04-05T13:18:38+02:00
       
  • Quantifying the relationship between the plasmapause and the inner
           boundary of small-scale field-aligned currents, as deduced from
           Swarm observations

    • Abstract: Quantifying the relationship between the plasmapause and the inner boundary of small-scale field-aligned currents, as deduced from Swarm observations
      Balázs Heilig and Hermann Lühr
      Ann. Geophys., 36, 595-607, https://doi.org/10.5194/angeo-36-595-2018, 2018
      This paper presents a statistical study of the equatorward boundary of small-scale field-aligned currents (SSFACs) as observed by ESA's Swarm satellites and investigates the relation between this boundary and NASA’s Van Allen probe observed plasmapause (PP). It is found that the two boundaries are closely coincident in the midnight LT sector, where the new PP is formed. Our results point to the role of SSFACs in the creation of the PP and offer a unique tool to monitor PP dynamics.
      PubDate: 2018-04-05T13:18:38+02:00
       
  • Semidiurnal solar tide differences between fall and spring transition
           times in the Northern Hemisphere

    • Abstract: Semidiurnal solar tide differences between fall and spring transition times in the Northern Hemisphere
      J. Federico Conte, Jorge L. Chau, Fazlul I. Laskar, Gunter Stober, Hauke Schmidt, and Peter Brown
      Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2018-29,2018
      Manuscript under review for ANGEO (discussion: open, 0 comments)
      Based on comparisons of meteor radar measurements with HAMMONIA model simulations, we show that the differences exhibited by the semidiurnal solar tide (S2) observed at middle and high latitudes of the Northern Hemisphere between equinox times are mainly due to distinct behaviors of the migrating semidiurnal (SW2) and the non-migrating westward propagating wave number 1 semidiurnal (SW1) tidal components.
      PubDate: 2018-04-03T13:18:38+02:00
       
  • New results on the mid-latitude midnight temperature maximum

    • Abstract: New results on the mid-latitude midnight temperature maximum
      Rafael L. A. Mesquita, John W. Meriwether, Jonathan J. Makela, Daniel J. Fisher, Brian J. Harding, Samuel C. Sanders, Fasil Tesema, and Aaron J. Ridley
      Ann. Geophys., 36, 541-553, https://doi.org/10.5194/angeo-36-541-2018, 2018
      The midnight temperature maximum (MTM) is a phenomenon resulting from the constructive interference of the atmospheric tides. This paper brings the analysis of a long data set (846 nights) from the NATION network along with new analysis techniques (harmonic background removal and 2-D temperature interpolation) to detect the MTM in the mid-latitude range.
      PubDate: 2018-04-03T13:18:38+02:00
       
  • Effects of solar activity and galactic cosmic ray cycles on the modulation
           of the annual average temperature at two sites in southern Brazil

    • Abstract: Effects of solar activity and galactic cosmic ray cycles on the modulation of the annual average temperature at two sites in southern Brazil
      Everton Frigo, Francesco Antonelli, Djeniffer S. S. da Silva, Pedro C. M. Lima, Igor I. G. Pacca, and José V. Bageston
      Ann. Geophys., 36, 555-564, https://doi.org/10.5194/angeo-36-555-2018, 2018
      Quasi-periodic variations in solar activity and galactic cosmic rays (GCRs) ondecadal and bidecadal timescales have been suggested as a climate forcingmechanism for many regions on Earth. One of these regions is southern Brazil,where the lowest values during the last century were observed for the totalgeomagnetic field intensity at the Earth's surface. These low values are dueto the passage of the center of the South Atlantic Magnetic Anomaly (SAMA),which crosses the Brazilian territory from east to west following a latitudeof ∼ 26°. In areas with low geomagnetic intensity, such as theSAMA, the incidence of GCRs is increased. Consequently, possible climaticeffects related to the GCRs tend to be maximized in this region. In this work,we investigate the relationship between the ∼ 11-year and ∼ 22-year cycles that are related to solar activity and GCRs and theannual average temperature recorded between 1936 and 2014 at two weatherstations, both located near a latitude of 26° S but at differentlongitudes. The first of these stations (Torres – TOR) is located in thecoastal region, and the other (Iraí – IRA) is located in the interior,around 450 km from the Atlantic Ocean. Sunspot data and the solar modulationpotential for cosmic rays were used as proxies for the solar activity and theGCRs, respectively. Our investigation of the influence of decadal andbidecadal cycles in temperature data was carried out using the wavelettransform coherence (WTC) spectrum. The results indicate that periodicities of 11 yearsmay have continuously modulated the climate at TOR via a nonlinear mechanism,while at IRA, the effects of this 11-year modulation period wereintermittent. Four temperature maxima, separated by around 20 years, weredetected in the same years at both weather stations. These temperature maximaare almost coincident with the maxima of the odd solar cycles. Furthermore,these maxima occur after transitions from even to odd solar cycles, that is,after some years of intense GCR flux. The obtained results offer indirectmathematical evidence that solar activity and GCR variations contributed toclimatic changes in southern Brazil during the last century. A comparison ofthe results obtained for the two weather stations indicates that the SAMAalso contributes indirectly to these temperature variations. The contributionof other mechanisms also related to solar activity cannot be excluded.
      PubDate: 2018-04-03T13:18:38+02:00
       
  • Climatology of the scintillation onset over southern Brazil

    • Abstract: Climatology of the scintillation onset over southern Brazil
      Jonas Sousasantos, Alison de Oliveira Moraes, José H. A. Sobral, Marcio T. A. H. Muella, Eurico R. de Paula, and Rafael S. Paolini
      Ann. Geophys., 36, 565-576, https://doi.org/10.5194/angeo-36-565-2018, 2018
      This work presents an analysis of the scintillation onset over the southern Brazil based on data from two solar maximum periods and simulation of the ionospheric conditions before the scintillation onset. The results shows some patterns which may help to prevent several satellite-based technological applications suffering disruptions due to scintillation issues.
      PubDate: 2018-04-03T13:18:38+02:00
       
  • High-resolution vertical velocities and their power spectrum observed with
           the MAARSY radar – Part 1: frequency spectrum

    • Abstract: High-resolution vertical velocities and their power spectrum observed with the MAARSY radar – Part 1: frequency spectrum
      Qiang Li, Markus Rapp, Gunter Stober, and Ralph Latteck
      Ann. Geophys., 36, 577-586, https://doi.org/10.5194/angeo-36-577-2018, 2018
      With the powerful MAARSY radar, we detected 3D wind fields and the vertical winds show a non-Gaussian distribution. We further obtained the frequency spectrum of vertical wind. The distribution of the spectral slopes under different wind conditions is derived and their comparisons with the background horizontal winds show that the spectra become steeper with increasing wind velocities under quiet conditions, approach a slope of −5/3 at 10 m/s and then maintain this slope for even stronger winds.
      PubDate: 2018-04-03T13:18:38+02:00
       
  • Study of sporadic E layers based on GPS radio occultation measurements
           and digisonde data over the Brazilian region

    • Abstract: Study of sporadic E layers based on GPS radio occultation measurements and digisonde data over the Brazilian region
      Laysa C. A. Resende, Christina Arras, Inez S. Batista, Clezio M. Denardini, Thainá O. Bertollotto, and Juliano Moro
      Ann. Geophys., 36, 587-593, https://doi.org/10.5194/angeo-36-587-2018, 2018
      We present new results on the behavior of sporadic E layers (Es layers) using GPS (global positioning system) radio occultation (RO) measurements obtained from the FORMOSAT-3/COSMIC satellites and digisonde data over Cachoeira Paulista, a low-latitude station in Brazil.
      PubDate: 2018-04-03T13:18:38+02:00
       
  • The effect of subauroral polarization streams on the mid-latitude
           thermospheric disturbance neutral winds: a universal time effect

    • Abstract: The effect of subauroral polarization streams on the mid-latitude thermospheric disturbance neutral winds: a universal time effect
      Hui Wang, Kedeng Zhang, Zhichao Zheng, and Aaron James Ridley
      Ann. Geophys., 36, 509-525, https://doi.org/10.5194/angeo-36-509-2018, 2018
      For subauroral polarization streams (SAPS) commencing at different universaltimes (UT), the strongest westward neutral winds exhibit large variationsin amplitudes. The effect of a sine-wave oscillation of SAPS on the neutral wind also exhibits UT variations in association with the solar illumination. The reduction in the electron density and enhancement in the air mass density are strongest when the maximum solar illumination collocates with the SAPS.
      PubDate: 2018-03-29T13:18:38+02:00
       
  • GREEN: A new Global Radiation Earth ENvironment model

    • Abstract: GREEN: A new Global Radiation Earth ENvironment model
      Angélica Sicard, Daniel Boscher, Sébastien Bourdarie, Didier Lazaro, Denis Standarovski, and Robert Ecoffet
      Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2018-26,2018
      Manuscript under review for ANGEO (discussion: open, 0 comments)
      GREEN (Global Radiation Earth ENvironment) is a new model providing particles fluxes at any location in the radiaiton belts, for energy between 1 keV to 10 MeV for electrons and between 1 keV and 800 MeV for protons. This model is composed of global models: AE8/AP8 and SPM and local models: SLOT model, OZONE, IGE-2006 for electrons and OPAL and geostationary model for protons.
      PubDate: 2018-03-29T13:18:38+02:00
       
  • Three-dimensional density and compressible magnetic structure in solar
           wind turbulence

    • Abstract: Three-dimensional density and compressible magnetic structure in solar wind turbulence
      Owen W. Roberts, Yasuhito Narita, and C.-Philippe Escoubet
      Ann. Geophys., 36, 527-539, https://doi.org/10.5194/angeo-36-527-2018, 2018
      In this study we use multi-point spacecraft measurements of magnetic field and electron density derived from spacecraft potential to investigate the three-dimensional structure of solar wind plasma turbulence. We see that there is a dependence on the plasma beta (ratio of thermal to magnetic pressure) as well as a dependence on the type of wind i.e. fast or slow.
      PubDate: 2018-03-29T13:18:38+02:00
       
  • Ionospheric and thermospheric response to the 27–28 February 2014
           geomagnetic storm

    • Abstract: Ionospheric and thermospheric response to the 27–28 February 2014 geomagnetic storm
      Khalifa Malki, Aziza Bounhir, Zouhair Benkhaldoun, Jonathan J. Makela, Nicole Vilmer, Daniel J. Fisher, Mohamed Kaab, Khaoula Elbouyahyaoui, Brian J. Harding, Amine Laghriyeb, Ahmed Daassou, and Mohamed Lazrek
      Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2018-24,2018
      Manuscript under review for ANGEO (discussion: open, 0 comments)
      The novelty of this paper resides in the fact that it addresses the termosphere/ionosphere coupling in a mid-latitude site in north Africa. We have used Fabry-Perot measurements of the thermospheric winds and wide-angle camera detection of ionospheric structurers, at an altitude of about 250 km. We have also used GPS data to extract the TEC over the studied area. We have focused our study on the 27 Feb geomagnetic storm.
      PubDate: 2018-03-28T13:18:38+02:00
       
  • Non-Gaussianity and cross-scale coupling in interplanetary magnetic field
           turbulence during a rope–rope magnetic reconnection event

    • Abstract: Non-Gaussianity and cross-scale coupling in interplanetary magnetic field turbulence during a rope–rope magnetic reconnection event
      Rodrigo A. Miranda, Adriane B. Schelin, Abraham C.-L. Chian, and José L. Ferreira
      Ann. Geophys., 36, 497-507, https://doi.org/10.5194/angeo-36-497-2018, 2018
      The solar wind is a tenuous turbulent plasma permeating the interplanetary space and is not well understood. A complex process called magnetic reconnection can act as a source of solar wind turbulence. Here we study this process using statistics. We demonstrate that high-order statistics of the magnetic field display a parabolic relation that is enhanced when magnetic reconnection occurs. Our results can help us understand the nature of solar wind turbulence.
      PubDate: 2018-03-23T13:18:38+01:00
       
  • Simultaneous 6300 Å airglow and radar observations of ionospheric
           irregularities and dynamics at the geomagnetic equator

    • Abstract: Simultaneous 6300 Å airglow and radar observations of ionospheric irregularities and dynamics at the geomagnetic equator
      Dustin A. Hickey, Carlos R. Martinis, Michael Mendillo, Jeffrey Baumgardner, Joei Wroten, and Marco Milla
      Ann. Geophys., 36, 473-487, https://doi.org/10.5194/angeo-36-473-2018, 2018
      We present observations of the Earth's upper atmosphere (ionosphere and thermosphere) near the Equator. Instruments such as cameras and radar systems are used to measure the characteristics of the this region and compare the different observations. One focus of the paper is on structured regions of low density and we find patterns in its development along with other new observations. We also show results of a local increase in temperature near midnight and investigate its extent and evolution.
      PubDate: 2018-03-22T13:18:38+01:00
       
  • Seasonal variations of thermospheric mass density at dawn/dusk from GOCE
           observations

    • Abstract: Seasonal variations of thermospheric mass density at dawn/dusk from GOCE observations
      Libin Weng, Jiuhou Lei, Eelco Doornbos, Hanxian Fang, and Xiankang Dou
      Ann. Geophys., 36, 489-496, https://doi.org/10.5194/angeo-36-489-2018, 2018
      Thermospheric mass density from the GOCE satellite for Sun-synchronous orbits between 83.5° S and 83.5° N normalized to 270 km during 2009–2013 has been used to develop our GOCE model at dawn/dusk local solar time sectors based on the empirical orthogonal function (EOF) method. We find that both amplitude and phase of the seasonal variations have strong latitudinal and solar activity dependences, and the annual asymmetry and effect of the Sun–Earth distance vary with latitude and solar activity.
      PubDate: 2018-03-22T13:18:38+01:00
       
  • Neutralized solar wind ahead of the Earth's magnetopause as contribution
           to non-thermal exospheric hydrogen

    • Abstract: Neutralized solar wind ahead of the Earth's magnetopause as contribution to non-thermal exospheric hydrogen
      Hans J. Fahr, Uwe Nass, Robindro Dutta-Roy, and Jochen H. Zoennchen
      Ann. Geophys., 36, 445-457, https://doi.org/10.5194/angeo-36-445-2018, 2018
      We investigate what fraction of the hot hydrogen atoms recently found from Lyman-alpha measurements in the Earth's upper exosphere could have their origin as energetic neutral atoms via charge exchange from protons of the shocked solar wind ahead of the magnetopause.Our calculations show that this contribution, although definitely present at larger exospheric heights, cannot explain the observations at lower altitudes.
      PubDate: 2018-03-21T13:18:38+01:00
       
 
 
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