Results 31 to 40 of about 24,484 (206)
The operational and research DTM-2020 thermosphere models
Journal of Space Weather and Space Climate, 2021 Aims: The semi-empirical Drag Temperature Models (DTM) predict the Earth’s thermosphere’s temperature, density, and composition, especially for orbit computation purposes.
Bruinsma Sean, Boniface Claude
doaj +1 more source
The Upper Atmosphere of HD17156b
, 2008 HD17156b is a newly-found transiting extrasolar giant planet (EGP) that orbits its G-type host star in a highly eccentric orbit (e~0.67) with an orbital semi-major axis of 0.16 AU.
A. D. Aylward +24 more
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Machine‐Learned HASDM Thermospheric Mass Density Model With Uncertainty Quantification
Space Weather, 2022 A thermospheric neutral mass density model with robust and reliable uncertainty estimates is developed based on the Space Environment Technologies (SET) High Accuracy Satellite Drag Model (HASDM) density database.
Richard J. Licata +3 more
doaj +1 more source
, 2017 Effects of subgrid-scale gravity waves (GWs) on the diurnal migrating tides are investigated from the mesosphere to the upper thermosphere for September equinox conditions, using a general circulation model coupled with the extended spectral nonlinear GW
Medvedev, Alexander S., Yiğit, Erdal
core +1 more source
Journal of Advances in Modeling Earth Systems, 2018 Key developments have been made to the NCAR Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension (WACCM‐X). Among them, the most important are the self‐consistent solution of global electrodynamics, and transport of O+ in ...
Han‐Li Liu +15 more
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Space Weather, 2022 Characterization of the thermospheric horizontal wind is an important challenge in atmospheric modeling due to its vital role in the transport of densities and energy, associations with the diurnal tide, and interplay with vertical winds that drive ...
Daniel A. Brandt, Aaron J. Ridley
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EUV Irradiance Inputs to Thermospheric Density Models: Open Issues and Path Forward
, 2018 One of the objectives of the NASA LWS Institute on Nowcasting of Atmospheric Drag for LEO Spacecraft was to investigate whether and how to increase the accuracy of atmospheric drag models by improving the quality of the solar forcing inputs, namely ...
Bruinsma, S., Vourlidas, A.
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Limb sounders tracking topographic gravity wave activity from the stratosphere to the ionosphere around midlatitude Andes [PDF]
, 2015 Several studies have shown that the surroundings of the highest Andes mountains at midlatitudes in the Southern Hemisphere exhibit gravity waves (GWs) generated by diverse sources which may traverse the troposphere and then penetrate the upper layers if ...
Alexander +41 more
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Role of gravity waves in vertical coupling during sudden stratospheric warmings
, 2016 Gravity waves are primarily generated in the lower atmosphere, and can reach thermospheric heights in the course of their propagation. This paper reviews the recent progress in understanding the role of gravity waves in vertical coupling during sudden ...
Medvedev, Alexander S., Yiğit, Erdal
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Predicting Atmospheric Effective Sound Speed Using Synthetic Infrasound and Machine Learning
Geophysical Research Letters, Volume 53, Issue 3, 16 February 2026.Abstract We introduce a machine learning (ML) model that reconstructs atmospheric conditions at the location of an explosive source using regionally recorded synthetic infrasound. A convolutional neural network (CNN) processes full waveforms and source‐receiver geometries to estimate the vertical profile of effective sound speed.
Alex Witsil +4 more
wiley +1 more source