Mathematics – Logic
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11602315x&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A2, CiteID A02315
Mathematics
Logic
Space Weather: Satellite Drag (1241), Atmospheric Processes: Thermospheric Dynamics (0358), Space Weather: Magnetic Storms (2788), Space Weather: Solar Effects, Space Weather: Impacts On Technological Systems
Scientific paper
In this paper thermosphere densities observed by the CHAMP and GRACE satellites and their orbital parameters are used to investigate the effect of periodic oscillations in thermospheric densities (7-27 days) caused by solar rotation and periodic magnetic activity on satellite orbits during 2003-2005. Two new results are obtained in this study. First, the response of the mean radius of the satellite orbit per revolution (MRPR) to the oscillations in the mean atmospheric density per revolution (MDPR) increased linearly with oscillation periods. Therefore, MRPR had a strong oscillation near the 27 day period. However, it had no obvious 7, 9, and 13.5 day oscillations, although there were strong oscillations at the same periods in MDPR. Second, there was a phase difference of $\pi\!\!/\!_{2 between the oscillations of MRPR and MDPR. The phases of the oscillations in MRPR led the phases of the variations in MDPR. The correlation coefficient between the 27 day oscillations in MRPR and those in MDPR was 0.83 with a phase difference of -6.8 days for CHAMP; the correlation for GRACE was 0.67 with a phase difference of -6.4 days. The amplitudes of the oscillations in MRPR of CHAMP were larger than those of GRACE because GRACE had a higher orbit than CHAMP. These features are in good agreement with our theoretical analysis.
Chen Guangming
Lei Jiuhou
Sutton Eric K.
Wang Wenbin
Xu Jiyao
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