Results 81 to 90 of about 126,100 (317)

Ion Kinetics in Thin Current Sheets at Lunar Distances

Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.
Abstract The magnetotail current sheet plays a crucial role in substorm dynamics, affecting the entire magnetosphere. Formation and reconnection of thin (ion‐gyroscale) current sheets initiate magnetospheric substorms. Theoretical models suggest that a transient, demagnetized ion population is key element of the thin current sheet configuration.
S. R. Kamaletdinov, A. V. Artemyev, A. Runov, V. Angelopoulos   +3 more
wiley   +1 more source

Searching for effects caused by thunderstorms in midlatitude sporadic E layers [PDF]

, 2017
Possible thunderstorm - sporadic E (Es) layer coupling effects are investigated during two measurement periods, one in 2013 and one in 2014. The analysis was based on ionospheric observations obtained from a Digisonde at Pruhonice, the Czech Republic, an
Barta, Veronika, Bencze, Pál, Berényi, Kitti A., Buresova, Dalia, Bór, József, Chum, Jaroslav, Haldoupis, Christos, Kis, Árpád, Popek, Martin, Pozoga, Mariusz, Sátori, Gabriella   +10 more
core   +2 more sources

Predicting CO Cameron‐Band Auroral Emission at Venus Using VEx Electron Observations

Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.
Abstract Various types of auroral emissions have been observed at (partially) magnetized planets (e.g., Earth, Jupiter, and Mars). Auroral emissions have also been observed at Venus, an unmagnetized planet, by the Pioneer Venus Orbiter (PVO) and ground‐based telescopes.
Shaosui Xu, Rudy A. Frahm, Yingjuan Ma, David L. Mitchell, Janet G. Luhmann, Jean‐Claude Gérard, Lauriane Soret, Robert J. Lillis   +7 more
wiley   +1 more source

Enhancing Geomagnetic Disturbance Predictions with Neural Networks: A Case Study on K-Index Classification

Atmosphere
To explore the application of neural networks for estimating geomagnetic field disturbances, this study pays particular attention to K-index classification.
Aizhan Altaibek, Beibit Zhumabayev, Aiganym Sarsembayeva, Marat Nurtas, Diana Zakir   +4 more
doaj   +1 more source

Possibilities of Estimating F2 Layer Peak Plasma Frequency Using HF Radiation from High Apogee Satellites over Arctic Region

Remote Sensing, 2021
Based on the results of mathematical modeling, we consider the possibility to estimate the plasma frequency F2 layer maximum of the polar ionosphere (critical frequency, foF2) using frequency-sweeping radiation from a highly elliptical spacecraft orbit ...
Igor Krasheninnikov, Givi Givishvili
doaj   +1 more source

SUDDEN DISTURBANCES OF THE IONOSPHERE [PDF]

Journal of Applied Physics, 1937
The phenomenon described in this paper is the occurrence of a very sudden change in ionization of a portion of the ionosphere. It manifests itself by the complete fading out of high-frequency radio transmission for a period of a few minutes to an hour or more, and by perturbations of terrestrial magnetism and earth currents.
openaire   +3 more sources

Investigation of Gas‐Surface Interactions and Neutral Atmospheric Properties and Their Impact on Satellite Drag Coefficients

Earth and Space Science, Volume 12, Issue 5, May 2025.
Abstract Changes in the thermospheric composition and temperature influence satellite drag coefficients through functional dependencies in the closed‐form solutions, and gas‐surface interactions via accommodation coefficients. This study investigates drag coefficient variations for the Gravity Recovery And Climate Experiment (GRACE) and Communications ...
Soumyajit Dey, Phillip C. Anderson, Aaron L. Bukowski, Marcin D. Pilinski   +3 more
wiley   +1 more source

A PLL-Based Doppler Method Using an SDR-Receiver for Investigation of Seismogenic and Man-Made Disturbances in the Ionosphere

Geosciences
The article describes in detail the equipment and method for measuring the Doppler frequency shift (DFS) on an inclined radio path, based on the principle of the phase-locked loop using an SDR receiver for the investigation of seismogenic and man-made ...
Nazyf Salikhov, Alexander Shepetov, Galina Pak, Vladimir Saveliev, Serik Nurakynov, Vladimir Ryabov, Valery Zhukov   +6 more
doaj   +1 more source

Recurrent and sporadic Forbush decreases during solar cycles 23–24

Solar-Terrestrial Physics, 2019
A comparison has been made between recurrent (associated with high-speed streams from coronal holes) and sporadic (caused by interplanetary coronal mass ejections (ICMEs)) Forbush decreases (FDs) in solar cycles 23 and 24 (as well as in the maxima of ...
Melkumyan A.A., Belov A.V., Abunina M.A., Abunin A.A., Eroshenko E.A., Oleneva V.A., Yanke V.G.   +6 more
doaj   +1 more source

Disturbance in the Daytime Midlatitude Upper F Region Associated with a Medium Scale Electrodynamic Vortex Motion of Plasma [PDF]

Journal of Astronomy and Space Sciences, 2016
Under the assumption of the presence of a medium-scale E × B drift vortex of plasma in the daytime midlatitude F region, and using a simplified ionospheric model, we demonstrate that the E × B drift produces noticeable perturbations in the horizontal ...
Valery V. Hegai, Vitaly P. Kim
doaj   +1 more source