Variations of thermospheric density during equinox and solstice

LI Yongping; SUN Yueqiang; WANG Xinyue; FU Zhenyu

doi:10.3981/j.issn.1000-7857.2019.06.014

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Science & Technology Review ›› 2019, Vol. 37 ›› Issue (6) : 104-113. DOI: 10.3981/j.issn.1000-7857.2019.06.014

Articles

Variations of thermospheric density during equinox and solstice

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1. National Space Science Center, Chinese Academy of Sciences, Beijing Key Laboratory of Space Environment Exploration, Beijing 100190, China;
2. Key Laboratory of Environmental Space Situation Awareness Technology, Chinese Academy of Sciences, Beijing 100190, China;
3. Laboratory of Space Environment Exploration, Chinese Academy of Sciences, Beijing 100190, China

Abstract

The thermospheric neutral density sees a strong variation during equinoxes and solstices due to the solar insolation variation. The long-term continual data from Chinese Atmospheric Density Detector installed on the satellite are used to study this variation, The main results of this study are that the thermospheric density has an obvious symmetry around March equinox and September equinox; the thermosphere density has an obvious asymmetry around June solstice and December solstice; the variations have an obvious hemispheric asymmetry in high latitude (around 80 degrees); the proportion of the atmospheric density is 3~3.6 times at the height of 670 km, 13 times at the height of 560 km; the latitude and the altitude contribute to this asymmetry; the comparison of the measured data and the NRLMSISE00 data shows that the NRLMSISE00 data cannot fully respond to the summer and winter hemisphere atmospheric density variations.

Key words

Jure solstic and Devember solstice / atmospheric density / solar far ultraviolet radiation

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LI Yongping, SUN Yueqiang, WANG Xinyue, FU Zhenyu. Variations of thermospheric density during equinox and solstice[J]. Science & Technology Review, 2019, 37(6): 104-113 https://doi.org/10.3981/j.issn.1000-7857.2019.06.014

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