Results 1 to 10 of about 6,139 (217)

Thermospheric Density Response to the QBO Signal

Atmosphere, 2023
In this study, we focused on the periodic variations of global average thermospheric density, derived from orbital decay measurements of about 5000 space objects from 1967 to 2013, by using the wavelet power spectrum method. The results demonstrated that
Bo Li, Ruifei Cui, Libin Weng
doaj   +2 more sources

A model of high-latitude thermospheric density [PDF]

Journal of Geophysical Research: Space Physics, 2015
We present an empirical model of the high-latitude air density at 450 km, derived from accelerometer measurements by the CHAllenging Minisatellite Payload and Gravity Recovery and Climate Experiment satellites during 2002–2006, which we call HANDY (High ...
Kosch, Michael, Sutton, Eric, Yamazaki (YY), Yosuke   +2 more
core   +7 more sources

Machine Learning Based Modeling of Thermospheric Mass Density

Space Weather
In this study, we propose a machine learning based approach to construct an empirical model of thermospheric mass densities, based on the MultiLayer Perceptron and bi‐directional Long Short‐Term Memory for ensemble learning model (MBiLE). The MBiLE model
Qian Pan, Chao Xiong, Hermann Lühr, Artem Smirnov, Yuyang Huang, Chunyu Xu, Xu Yang, Yunliang Zhou, Yang Hu   +8 more
doaj   +3 more sources

Study on the Thermospheric Density Distribution Pattern during Geomagnetic Activity

Applied Sciences, 2023
The atmospheric density of the thermosphere is a fundamental parameter for spacecraft launch and orbit control. Under magnetic storm conditions, the thermospheric atmospheric density experiences significant fluctuations, which have a negative impact on ...
Lirong Yin, Lei Wang, Lijun Ge, Jiawei Tian, Zhengtong Yin, Mingzhe Liu, Wenfeng Zheng   +6 more
doaj   +1 more source

Thermospheric temperature and density variations [PDF]

Proceedings of the International Astronomical Union, 2009
AbstractThe thermosphere is the transition region from the atmosphere to space. Both the solar ultraviolet radiation and the solar wind energy inputs have caused significant thermospheric variations from past to present. In order to understand thermospheric/ionospheric disturbances in association with changes in solar activity, observational and ...
Hitoshi Fujiwara, Yasunobu Miyoshi, Hidekatsu Jin, Hiroyuki Shinagawa, Yuichi Otsuka, Akinori Saito, Mamoru Ishii   +6 more
openaire   +1 more source

Large‐Scale Disturbances in the Upper Thermosphere Induced by the 2022 Tonga Volcanic Eruption

Geophysical Research Letters, 2023
The effects of volcanic eruptions on the ionosphere have been well studied, however, evidence for the anticipated upper atmospheric neutral variations and their exact extents of change are rarely available.
Ruoxi Li, Jiuhou Lei, Jürgen Kusche, Tong Dang, Fuqing Huang, Xiaoli Luan, Shun‐Rong Zhang, Maodong Yan, Ziyi Yang, Feifan Liu, Xiankang Dou   +10 more
doaj   +1 more source

Study on the Hemispheric Asymmetry of Thermospheric Density Based on In-Situ Measurements from APOD Satellite

Atmosphere, 2023
In this article, high spatiotemporal resolution data obtained by the atmospheric density detector carried by China’s APOD satellite are used to study the hemispheric asymmetry of thermospheric density.
Jiangzhao Ai, Yongping Li, Xianguo Zhang, Chao Xiao, Guangming Chen, Xiaoliang Zheng, Zhiliang Zhang   +6 more
doaj   +1 more source

Longitudinal Variation of Thermospheric Density during Low Solar Activity from APOD Observations

Atmosphere, 2023
The longitudinal distribution of upper atmospheric density has been broadly studied. However, the studies mostly focused on 24 h averaged distribution.
Guangming Chen, Xie Li, Maosheng He, Shushi Liu, Haijun Man, Hong Gao, Yongping Li   +6 more
doaj   +1 more source

Tidal signatures of the thermospheric mass density and zonal wind at midlatitude: CHAMP and GRACE observations [PDF]

Annales Geophysicae, 2015
By using the accelerometer measurements from CHAMP and GRACE satellites, the tidal signatures of the thermospheric mass density and zonal wind at midlatitudes have been analyzed in this study.
C. Xiong, C. Xiong, Y.-L. Zhou, H. Lühr, H. Lühr, S.-Y. Ma   +5 more
doaj   +1 more source

Two‐Line Elements Based Thermospheric Mass Density Specification From Parameter Optimization of a Physics‐Based Model

Space Weather, 2023
Accurately estimating the mass density of the thermosphere can assist satellite operators in planning missions and optimizing satellite orbits, reducing the risk of collisions.
Dexin Ren, Jiuhou Lei
doaj   +1 more source