Results 61 to 70 of about 24,137 (262)

Vertical winds in the thermosphere [PDF]

Journal of Geophysical Research: Space Physics, 2012
The neutral vertical circulation in the thermosphere plays an important role in redistributing heat and momentum and strongly affects the neutral composition, as well as plasma and electrodynamic processes. Vertical wind measurements in this altitude range are difficult, however, and the available data give limited temporal, spatial, and vertical ...
Miguel Larsen, John W. Meriwether
openaire   +2 more sources

Long‐Term Trends of Ionospheric Day‐to‐Day Variability During the Past Century

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract In this study, we explore the long‐term trend of ionospheric day‐to‐day variability induced by atmospheric perturbations over the past century, using time‐slice simulations by the whole atmospheric model. The main results show that the magnitude of the trends in the past century maximizes ∼±1% of the seasonal mean per decade.
Xu Zhou, Wenbo Li, Huixin Liu, Lianhuan Hu, Yi Li, Xinan Yue   +5 more
wiley   +1 more source

Statistical Characterization of GITM Thermospheric Horizontal Winds in Comparison to GOCE Estimations

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
doaj   +1 more source

Chemical Heating as a Feedback Mechanism in the Mesopause Region

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract An analytical expression is derived which shows that the release of chemical heat from exothermic chemical reactions is a negative nonlinear feedback mechanism relative to temperature in the mesopause region. This role is confirmed through model simulations. This feedback mechanism stabilizes the thermal regime of the mesopause region.
M. Grygalashvyly, W. Ward, C. C. Stephan, P. Hartogh   +3 more
wiley   +1 more source

Seasonal Water "Pump" in the Atmosphere of Mars: Vertical Transport to the Thermosphere

, 2019
We present results of simulations with the Max Planck Institute general circulation model (MPI-MGCM) implementing a hydrological cycle scheme. The simulations reveal a seasonal water "pump" mechanism responsible for the upward transport of water vapor ...
Hartogh, Paul, Medvedev, Alexander S., Rodin, Alexander V., Shaposhnikov, Dmitry S.   +3 more
core   +1 more source

Auroral Asymmetry Associated With the South Atlantic Anomaly

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract The South Atlantic anomaly (SAA) exerts a weakening effect on magnetic field strength on Earth, however, little is known of its effect on the auroral spatial distribution and temporal evolution. Using Defense Meteorological Satellite Program/Special Sensor Ultraviolet Spectrographic Imager ultraviolet data spanning 2016–2023, we investigated ...
Wenrui Wang, Keyi Huang, Qiugang Zong, Ying Liu, Li Li, Yuguang Ye   +5 more
wiley   +1 more source

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.
core   +1 more source

On the variations of the thermospheric structure [PDF]

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1965
The paper discusses the properties of the different effects which have been found to occur in the thermosphere and some conclusions which can be drawn with regard to the physics of the thermosphere. In the discussion of the diurnal variation the emphasis is on the behaviour of the diurnal amplitude in density during the solar cycle. At the height range
openaire   +2 more sources

Statistical Study on the Lower Mesospheric and Upper Stratospheric Ozone Changes Observed by Aura MLS Satellite During the Multiple Solar Eclipses

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 20, 28 October 2025.
Abstract Solar eclipse events (SEs) provide an excellent natural experiment for the response of the middle atmosphere to short‐term changes in solar radiation. For this study, we quantify radiation variations through obscuration, which is defined as the fraction of the solar disk obscured by the Moon during SEs.
T. Yang, T. Nagahama, A. Mizuno
wiley   +1 more source

Spatial sampling of the thermospheric vertical wind field at auroral latitudes [PDF]

, 2011
Results are presented from two nights of bistatic Doppler measurements of neutral thermospheric winds using Fabry!Perot spectrometers at Mawson and Davis stations in Antarctica.
Anderson, Aruliah, Aruliah, Aruliah, Biondi, Burnside, C. Anderson, Chun, Conde, Conde, Conde, Conde, Conde, Conde, Cooper, Greet, Greet, Guo, Hunsucker, Innis, Innis, Innis, Ishii, Ishii, Ishii, Jones, Kosch, M. Conde, M. J. Kosch, P. Dyson, Picone, Price, Rees, Rishbeth, Sipler, Smith, Smith, Smith, Smith, Spencer, Spencer, T. Davies, Wardill, Østgaard   +43 more
core   +1 more source