Results 41 to 50 of about 8,248 (257)

Detection of wave activity in measurements of thermospheric vertical winds and temperatures at subauroral latitudes

Frontiers in Astronomy and Space Sciences
The need for high precision measurements of vertical winds with uncertainties on the scale of 3–5 m s−1 and a temporal cadence of 1–2 min to achieve detection of gravity wave (GW) structure has made it exceedingly difficult to study the response of the ...
Anneliese L. Schmidt, John W. Meriwether, Matthew B. Cooper, Andrew J. Gerrard, Lindsay V. Goodwin, Shun-Rong Zhang, Ying Ye   +6 more
doaj   +1 more source

Global Wind Field Reconstruction in the Mesosphere and Lower Thermosphere (MLT) During Geomagnetic Storms by Fusing TIDI and SABER Data: A Generative Adversarial Network (GAN) Approach

Geoscience Data Journal, Volume 13, Issue 3, July 2026.
ABSTRACT The Mesosphere and Lower Thermosphere establish an essential connection between Earth's lower atmosphere and upper atmosphere because wind patterns essential for atmospheric movement also influence energy distribution and chemical movements during geomagnetic storms that disrupt satellite operations and space weather prediction systems.
Yunhao Si
wiley   +1 more source

Case study of the mesospheric and lower thermospheric effects of solar x-ray flares: Coupled ion-neutral modelling and comparison with EISCAT and riometer measurements [PDF]

, 2008
Two case studies of upper mesospheric and lower thermospheric (UMLT) high-latitude effects of solar X-ray flares are presented. Sodankylä Ion-neutral Chemistry Model (SIC) electron density profiles agree with D-region EISCAT and riometer ...
Beharrell, M.J., A. Seppälä, Verronen, P.T., Seppälä, A., Ulich, T., C.-F. Enell, Enell, C.-F., Honary, F., P. T. Verronen, J. P. Vierinen, T. Ulich, A. Kero, E. Turunen, M. J. Beharrell, Vierinen, J.P., Turunen, E., F. Honary, Kero, A.   +17 more
core   +1 more source

2005 August 24 TIEGCM-Weimer thermosphere-ionosphere results

, 2021
Results for the thermosphere-ionosphere from the Thermosphere-Ionosphere Electrodynamic General Circulation Model (TIEGCM) for 2005 August 24 geomagnetic ...
Pham, Kevin
core   +1 more source

Validation of Auric Model with EUV/FUV Dayglow Observation of STP78-1 Satellite [PDF]

Journal of Astronomy and Space Sciences, 2007
We carried out a validation study on AURIC FUV/EUV dayglow calculation with OII 834AA, OI 989AA, OI 1027AA, NII 1085AA, NI 1134AA, NI 1200AA, OI 1304AA, OI 1356AA dayglows observed by STP78-1 satellite.
Mi Ji Kang, Jeong-Han Kim, Yong Ha Kim
doaj   +1 more source

Atmospheric Tides Imprint a Wavenumber‐4 Structure in Topside Ionospheric ELF Wave Intensity

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Atmospheric tides produce a well known pronounced longitudinal wavenumber‐4 (WN‐4) structure in the ionosphere, but their influence on electromagnetic‐wave propagation through the ionosphere remains poorly constrained. Here we use DEMETER satellite measurements to show that the extremely low frequency (ELF) electric field in the low‐latitude ...
Li Liao, Shufan Zhao, Maosheng He, Yatong Cui, Jinlei Li   +4 more
wiley   +1 more source

First tristatic studies of meso-scale ion-neutral dynamics and energetics in the high-latitude upper atmosphere using collocated fpis and EISCAT radar [PDF]

, 2004
A unique experiment was undertaken during the nights of 27 and 28 February 2003. Tristatic Fabry-Perot Interferometer (FPI) measurements of the upper thermosphere were co-located with tristatic EISCAT radar measurements of the ionosphere.
Aylward, A. D., McWhirter, I., Kosch, M.J., Ford, E.A.K., Aruliah, A.L., Ford, E. A. K., Griffin, E.M., Aruliah, A. L., Howells, V.S.C., Aylward, A.D., Charalambous, A., Howells, V. S. C., Kosch, M. J., Davis, C.J., Griffin, E. M., Davis, C. J.   +15 more
core  

Drag Coefficient Constraints for Space Weather Observations in the Upper Thermosphere

Space Weather, 2022
The space weather research community relies heavily on thermospheric density data to understand long‐term thermospheric variability, construct assimilative, empirical, and semiempirical global atmospheric models and validate model performance. One of the
Valerie Bernstein, Marcin Pilinski
doaj   +1 more source

First Lidar Observations of Ionosphere‐Thermosphere‐Mesosphere (ITM) Na Transition Layer (∼120–95 km): Regular Occurrence Over Boulder (40.13°N, 105.24°W) and Possible Formation Mechanisms

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Using lidar observations of 12 monthly composites of normalized Na density ratios, we have discovered an Ionosphere‐Thermosphere‐Mesosphere (ITM) Na transition layer from ∼120 to ∼95 km over Boulder, Colorado. The transition layer occurs regularly in all months with a distinct separation from the predawn TINa layer and exhibits coherent ...
Yingfei Chen, Xinzhao Chu
wiley   +1 more source

Science Through Machine Learning: Quantification of Post‐Storm Thermospheric Cooling

Space Weather, 2022
Machine learning (ML) models are universal function approximators and—if used correctly—can summarize the information content of observational data sets in a functional form for scientific and engineering applications.
Richard J. Licata, Piyush M. Mehta, Daniel R. Weimer, Douglas P. Drob, W. Kent Tobiska, Jean Yoshii   +5 more
doaj   +1 more source