Results 71 to 80 of about 6,139 (217)

Global Sensitivity Analysis of Nitric Oxide‐Related Chemical Reaction Rates in the Global Ionosphere Thermosphere Model

Space Weather
Accurate modeling of thermospheric impact of high solar and geomagnetic activities is crucial for safeguarding our space‐based infrastructure. However, current modeling capabilities are still unable to accurately predict thermospheric density, which is a
Atishnal E. Chand, George Bowden, Melrose Brown, Aaron J. Ridley   +3 more
doaj   +1 more source

Thermospheric hydrogen - Absolute densities and temporal variations deduced from in situ measurements [PDF]

Thermospheric model based on Explorer 32 hydrogen ion density measurements including periodic variations and temperature factors due to local time, solar activity, and magnetic ...
Brinton, H. C., Mayr, H. G.
core   +1 more source

Ensemble Kalman filter data assimilation in a Babcock-Leighton solar dynamo model: an observation system simulation experiment for reconstructing meridional flow-speed

, 2014
Accurate knowledge of time-variation in meridional flow-speed and profile is crucial for estimating a solar cycle's features, which are ultimately responsible for causing space climate variations.
Anderson, Jeffrey L., Dikpati, Mausumi, Mitra, Dhrubaditya   +2 more
core   +1 more source

Imprint of the Quasi‐Biennial Oscillation on the Ionosphere and Thermosphere

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract The Quasi‐Biennial Oscillation (QBO) is a dominant mode of stratospheric variability and is known to modulate the variability of the ionosphere‐thermosphere (IT) system. However, the extent of its influence on the ionosphere‐thermosphere system remains uncertain due to weak signals and confounding with similar periodicities in solar flux.
D. Singh, L. P. Goncharenko, S. R. Zhang
wiley   +1 more source

Flying Through Uncertainty

Space Weather, 2020
Space weather is the main source of uncertainty in the position of all objects in low Earth orbit (LEO) below about 1,000 km. The main impact is strong variation in the neutral density of the thermosphere as it responds to radiative inputs from the Sun ...
T. E. Berger, M. J. Holzinger, E. K. Sutton, J. P. Thayer   +3 more
doaj   +1 more source

Investigation of thermospheric winds relative to space station orbital altitudes [PDF]

An investigation of thermospheric winds, relative to the space station orbital altitudes, was made in order to provide information that is useful in an environmental disturbance assessment.
Susko, M.
core   +1 more source

Latitudinal and Hemispheric Responses of Solar Quiet Ionospheric Currents During Two Annular Solar Eclipses: Evidence From Low to Mid‐Latitude Observations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract A sudden drop in solar radiation during an annular (or total) eclipse directly affects ionospheric electrodynamics, primarily through the reduction of solar extreme ultraviolet (EUV) and soft X‐ray flux, which are responsible for generating the ionospheric plasma.
Charles Owolabi, Hyunju K. Connor, Don Hampton, V. Sai Gowtam, Dogacan Ozturk, Andrés Calabia, Amy M. Keesee   +6 more
wiley   +1 more source

Modulation of Thermospheric Circulation by Lower‐Thermospheric Winter‐to‐Summer Circulation: The Atmosphere Gear Effect

Geophysical Research Letters
This study investigates the impact of the lower‐thermospheric winter‐to‐summer circulation on the thermosphere's thermal structure and meridional circulation. Using NCAR TIE‐GCM, we compare simulations with and without the lower‐thermospheric circulation,
Jack C. Wang, Jia Yue, Wenbin Wang, Liying Qian   +3 more
doaj   +1 more source

Self-consistent modelling of the polar thermosphere and ionosphere to magnetospheric convection and precipitation (invited review) [PDF]

It has recently been demonstrated that the dramatic effects of plasma precipitation and convection on the composition and dynamics of the polar thermosphere and ionosphere include a number of strong interactive, or feedback, processes.
Fuller-Rowell, T., Moffett, R., Quegan, S., Rees, D.   +3 more
core   +1 more source

Correlation study of some solar activity indices in the cycles 21 - 23 [PDF]

, 2015
The correlation coefficients of the linear regression of six solar indices versus F10,7 were analyzed in solar cycles 21, 22 and 23. We also analyzed the interconnection between these indices and F10,7 with help of the approximation by the polynomials of
Bruevich, E. A., Bruevich, V. V.
core