Results 81 to 90 of about 1,392 (166)

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

Ionospheric Vertical Plasma Drifts Over South America: Long‐Term Multi‐Instrument Observations and TIEGCM and WACCM‐X Evaluations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract We present the first comprehensive multi‐instrument climatological study of quiet‐time equatorial F‐region vertical plasma drifts across South America, a region where the magnetic declination angle varies significantly. Our analysis of well‐established long‐term ground‐based data sets from the Jicamarca incoherent scatter radar spanning 1968 ...
Sophia R. Laranja, Bela G. Fejer, Clezio M. Denardini, Ludger Scherliess, Laysa C. A. Resende, Sony S. Chen, Giorgio A. S. Picanço   +6 more
wiley   +1 more source

Jupiter's Auroral Ionosphere: Hybrid Monte Carlo, Auroral Spectrum and Conductivity Modeling

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract We present a new model of auroral precipitation and associated phenomena at Jupiter, called the Jupiter Auroral Ionosphere Code (JAIC). The hybrid model follows the primary electron population using a Monte Carlo code that runs on a GPU, and computes the contribution of the secondaries using a two‐stream approximation.
J. D. Nichols
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

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

HIWIND Observation of Daytime Thermospheric Winds Over New Zealand and Comparison With Model Simulation

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract A balloon borne Fabry Perot interferometer called High altitude Interferometer WIND observation (HIWIND) flew from Wanaka, New Zealand (44.69S, 169.14E) in April 2025 to observe mid‐latitude thermospheric winds in the southern hemisphere for the first time.
Qian Wu, Haonan Wu, Wenbin Wang
wiley   +1 more source

Thermal Escape of Atomic Hydrogen on Mars: A Comprehensive View With a General Circulation Model

Journal of Geophysical Research: Planets, Volume 131, Issue 6, June 2026.
Abstract Mars loses water mainly through the photodissociation of water vapor, followed by the thermal escape of light hydrogen atoms. Observations have revealed large seasonal variations in hydrogen concentration in the upper thermosphere, peaking during southern summers and intensifying during dust storms.
Alexander S. Medvedev, Ngan H. D. Trinh
wiley   +1 more source

An empirical model (CH-Therm-2018) of the thermospheric mass density derived from CHAMP

, 2018
. Thermospheric drag is the major non-gravitational perturbation acting on Low Earth Orbit (LEO) satellites at altitudes up to 1000 km. The drag depends on the thermospheric density, which is a key parameter in the planning of LEO missions, e.g.
Chao Xiong, Mathis Bloßfeld, Hermann Lühr, Sergei Rudenko, Michael Schmidt   +4 more
core   +1 more source

A Machine‐Learning‐Based Global Thermospheric Density Forecasting Model

Space Weather, Volume 24, Issue 6, June 2026.
Abstract Thermospheric mass density governs aerodynamic drag in low Earth orbit and is a primary source of uncertainty in orbit prediction and conjunction assessment, particularly during geomagnetic disturbances. We present AETHER‐P3 ${\mathrm{P}}^{3}$ (Accelerometer‐driven Estimation of THERmospheric density–A Physics‐Informed Probabilistic Prediction
Ruochen Wang, Xiaoli Bai
wiley   +1 more source

Thermospheric density from Starlink TLE: data analysis and preliminary results

Earth, Planets and Space
This study examines the feasibility of utilizing Two-Line Element (TLE) data from Starlink satellites to estimate thermospheric density. TLE data for satellites in orbital decay were collected from September 19 to November 6, 2024.
Mamoru Yamamoto, Takuya Sori
doaj   +1 more source