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• 日球层物理和太阳系探测 • Previous Articles     Next Articles

Variations of Thermosphere Density Based on Joint Analysis of In-Situ Measurement Data From Shenzhou Spacecrafts

SUN Lilin1,2, QIN Guotai1, ZHU Guangwu1   

  1. 1. Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049
  • Received:2010-11-04 Revised:2011-09-16 Online:2012-03-15 Published:2012-03-15

Abstract: Based on the measurements made by Atmospheric Density Detectors (ADDs) onboard Chinese spacecraft Shenzhou 2-4, the variations of thermosphere density are revealed. During the quiet period, the density at spacecraft altitude of 330~410km exhibited a dominant diurnal variation, with high value on dayside and low value on nightside. The ratio of the diurnal maximum density to the minimum ranged from 1.7 to 2.0. The ratio shows a positive correlation with the level of solar activity and a negative correlation with the level of geomagnetic activity. When a geomagnetic disturbance comes, the atmospheric density at the altitude of 330~410km displayed a global enhancement. For a strong geomagnetic disturbance, the atmospheric density increased by about 56%, and reached its maximum about 6~7 hours after the geomagnetic disturbance peak. The density asymmetry was also observed both in the southern and northern hemisphere during the geomagnetic disturbance peak.

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