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Geospace magnetic field responses to interplanetary shocks
Wang, C.; Liu, J. B.; Li, H.; Huang, Z. H.; Richardson, J. D.; Kan, J. R.; 北京8701信箱
Source PublicationJournal of Geophysical Research-Space Physics
KeywordWind Dynamic Pressure Steady-state Response Low-latitude Stations Solar-wind Geosynchronous Orbit Geomagnetic-field Sudden Impulses
AbstractWe 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 magnitude of the geosynchronous magnetic field (dB(z)) responses to IP shocks depends strongly on local time, which peaks near the noon meridian; however, the relative magnitude of the responses depends only weakly on local time. These results are similar to those obtained from the statical study of the responses to solar wind dynamic pressure pulses. However, negative responses (where dBz is negative) were sometimes observed in the nightside of the magnetosphere even though the IP shocks always caused increases in the solar wind dynamic pressure, a new phenomenon not widely reported in the literature. Our analysis shows that similar to 75% of negative responses in the midnight sector are associated with southward interplanetary magnetic field. 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 at the geosynchronous orbit near local noon and the amplitude of sudden impulses (dSYM-H) on the ground are highly correlated.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Wang, C.,Liu, J. B.,Li, H.,et al. Geospace magnetic field responses to interplanetary shocks[J]. Journal of Geophysical Research-Space Physics,2009,114:A05211.
APA Wang, C..,Liu, J. B..,Li, H..,Huang, Z. H..,Richardson, J. D..,...&北京8701信箱.(2009).Geospace magnetic field responses to interplanetary shocks.Journal of Geophysical Research-Space Physics,114,A05211.
MLA Wang, C.,et al."Geospace magnetic field responses to interplanetary shocks".Journal of Geophysical Research-Space Physics 114(2009):A05211.
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