Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm44a..08w&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM44A-08
Physics
2139 Interplanetary Shocks, 2784 Solar Wind/Magnetosphere Interactions, 2799 General Or Miscellaneous, 6939 Magnetospheric Physics (2700)
Scientific paper
We perform a statistical survey of geospace magnetic field responses, including the geosynchronous magnetic field and the sudden impulses on the ground, to interplanetary shocks (IP shocks) between 1998 and 2005. The magnitudes of the geosynchronous magnetic field (dBz) responses to IP shocks peak near the noon meridian, however the the dependence of the relative amplitude of the responses is much weaker. Negative responses (where dBz is negative) were sometimes observed in the nightside of the magnetosphere even though the IP shocks always cause increases in the solar wind dynamic pressure, a new phenomenon not widely reported in the literature. For a moderately-compressed magnetosphere, the amplitude of the geosynchronous response dBz could be determined by the average value of the background local magnetic field. As the magnitude of the upstream solar wind dynamic pressure increases, the rate of response increases correspondingly. The dBz around the subsolar region is mainly determined by the the change of the square root of the solar wind dynamic pressure across the corresponding IP shock, while the amplitude of sudden impulses correlates better with this parameter when the magnetosphere is less compressed. The dBz at the geosynchronous orbit near local noon and the amplitude of sudden impulses (dSYM-H) on the ground are highly correlated.
Li Handong
Liu Jinjie
Richardson John D.
Wang Chenjie
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