Results 1 to 10 of about 1,392 (166)

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   +5 more sources

Improving Thermospheric Density Predictions in Low‐Earth Orbit With Machine Learning [PDF]

Space Weather
Thermospheric density is one of the main sources of uncertainty in the estimation of satellites' position and velocity in low‐Earth orbit. This has negative consequences in several space domains, including space traffic management, collision avoidance ...
Giacomo Acciarini, Edward Brown, Tom Berger, Madhulika Guhathakurta, James Parr, Christopher Bridges, Atılım Güneş Baydin   +6 more
doaj   +5 more sources

Real‐Time Thermospheric Density Estimation via Two‐Line Element Data Assimilation

Space Weather, 2020
Inaccurate estimates of the thermospheric density are a major source of error in low Earth orbit prediction. Therefore, real‐time density estimation is required to improve orbit prediction.
David J. Gondelach, Richard Linares
doaj   +3 more sources

Study on the Thermospheric Density Distribution Pattern during Geomagnetic Activity [PDF]

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   +2 more sources

A model of high‐latitude thermospheric density [PDF]

Journal of Geophysical Research: Space Physics, 2015
AbstractWe 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‐Latitude Atmospheric Neutral DensitY). HANDY consists of a quiet model and disturbance model.
Yosuke Yamazaki, Michael J. Kosch, Eric K. Sutton   +2 more
openaire   +6 more sources

Seasonal variation of thermospheric density and composition [PDF]

Journal of Geophysical Research, 2009
Thermospheric neutral density and composition exhibit a strong seasonal variation, with maxima near the equinoxes, a primary minimum during northern hemisphere summer, and a secondary minimum during southern hemisphere summer. This pattern of variation is described by thermospheric empirical models. However, the mechanisms are not well understood.
Liying Qian, Stanley C Solomon, Timothy J Kane   +2 more
exaly   +2 more sources

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   +2 more sources

Impact of Thermospheric Mass Density on the Orbit Prediction of LEO Satellites

Space Weather, 2020
Many thermospheric mass density (TMD) variations have been recognized in observations and physical simulations; however, their impact on the low‐Earth‐orbit satellites has not been fully evaluated.
Changyong He, Yang Yang, Brett Carter, Kefei Zhang, Andong Hu, Wang Li, Florent Deleflie, Robert Norman, Suqin Wu   +8 more
doaj   +2 more sources

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

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