Results 21 to 30 of about 2,463,978 (199)

Calibration of GRACE on-board accelerometers for thermosphere density derivation [PDF]

Geo-spatial Information Science, 2022
Low Earth Orbit satellite on-board accelerometers play an important role in improving our understanding of thermosphere density; however, the accelerometer-derived densities are subject to accelerometer calibration errors. In this study, two different dynamic calibration schemes, the accelerometer parameter-incorporated orbit fitting and precise orbit ...
Min Li, Zhuo Lei, Wenwen Li, Kecai Jiang, Youcun Wang, Qile Zhao   +5 more
openaire   +2 more sources

A new method for studying the thermospheric density variability derived from CHAMP/STAR accelerometer data for magnetically active conditions [PDF]

Annales Geophysicae, 2007
Thermospheric densities deduced from STAR accelerometer measurements onboard the CHAMP satellite are used to characterize the thermosphere and its response to space weather events. The STAR thermospheric density estimates are analysed using a Singular
M. Menvielle, M. Menvielle, C. Lathuillère, S. Bruinsma, R. Viereck   +4 more
doaj   +1 more source

A New Method for Deriving the Nightside Thermospheric Density Based on GUVI Dayside Limb Observations

Space Weather, 2020
We propose a new method to derive the nightside thermospheric density by extending Global Ultraviolet Imager (GUVI) dayside limb observations using empirical orthogonal function (EOF) analysis. First, we acquire the GUVI dayside total mass density during
Tingting Yu, Zhipeng Ren, You Yu, Weixing Wan   +3 more
doaj   +1 more source

Thermospheric Neutral Density Variation During the “SpaceX” Storm: Implications From Physics‐Based Whole Geospace Modeling

Space Weather, 2022
The Starlink satellites launched on 3 February 2022 were lost before they fully arrived in their designated orbits. The loss was attributed to two moderate geomagnetic storms that occurred consecutively on 3–4 February.
Dong Lin, Wenbin Wang, Katherine Garcia‐Sage, Jia Yue, Viacheslav Merkin, Joseph M. McInerney, Kevin Pham, Kareem Sorathia   +7 more
doaj   +1 more source

Using Temporal Relationship of Thermospheric Density With Geomagnetic Activity Indices and Joule Heating as Calibration for NRLMSISE‐00 During Geomagnetic Storms

Space Weather, 2022
The responses of thermospheric densities to geomagnetic activity indices and Joule heating are analyzed during 265 geomagnetic storms and can be used to calibrate the model NRLMSISE‐00 with neutral mass density observed at 400 km based on the CHAMP ...
Xin Wang, Juan Miao, Xian Lu, Ercha Aa, Binxian Luo, Ji Liu, Yu Hong, Yuxian Wang, Tingling Ren, Ruiyun Zeng, Chenxi Du, Siqing Liu   +11 more
doaj   +1 more source

Time-dependent responses of the neutral mass density to fixed magnetospheric energy inputs into the cusp region in the thermosphere during a period of large IMF B Y: a high-resolution two-dimensional local modeling

Earth, Planets and Space, 2021
Thermospheric mass density values around the 400-km altitude in the cusp can be significantly enhanced as compared to regions around the cusp. To gain insights into the extent to which the magnitude of the cusp mass density enhancements can be explained ...
Tomokazu Oigawa, Hiroyuki Shinagawa, Satoshi Taguchi   +2 more
doaj   +1 more source

Recent progress on the retrieval and modeling of thermosphere mass density

地球与行星物理论评, 2023
The thermosphere is the atmospheric layer extending from about 90 km to nearly 1000 kilometers, which is an important interreaction area between the Sun and the Earth.
Jiuhou Lei, Ruoxi Li, Dexin Ren, Libin Weng, Haibing Ruan   +4 more
doaj   +1 more source

Atomic nitrogen densities in the thermosphere

Geophysical Research Letters, 1976
Recently atomic nitrogen densities of ∼106cm−3 were measured at 400 km by the open source mass spectrometer on the Atmosphere Explorer‐C satellite (AE‐C). Daytime N densities ∼5 × 107cm−3 at 160 km have also been inferred from airglow and other measurements on AE‐C.
D. G. Torr, M. R. Torr, D. W. Rusch, P. B. Hays, K. Mauersberger, J. C. G. Walker, N. W. Spencer, A. E. Hedin, H. C. Brinton, R. F. Theis   +9 more
openaire   +1 more source

Density‐Temperature Synchrony in the Hydrostatic Thermosphere [PDF]

Journal of Geophysical Research: Space Physics, 2019
AbstractThe paper presents a detailed analysis of the density‐temperature (ρ‐T) synchrony in the thermosphere using a hydrostatic general circulation model. The numerical models in general offer not only great potential for forecasting the transient response of the thermosphere but also are excellent tools for understanding the driving mechanisms of ...
Timothy Kodikara, Brett Carter, Robert Norman, Kefei Zhang   +3 more
openaire   +1 more source

Thermospheric density perturbations in response to substorms [PDF]

Journal of Geophysical Research: Space Physics, 2014
AbstractWe use 5 years (2001–2005) of CHAMP (Challenging Minisatellite Payload) satellite data to study average spatial and temporal mass density perturbations caused by magnetospheric substorms in the thermosphere. Using statistics from 2306 substorms to construct superposed epoch time series, we find that the largest average increase in mass density ...
Clausen, L. B. N., Milan, S. E., Grocott, Adrian   +2 more
openaire   +3 more sources