Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm34a..08w&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM34A-08
Physics
[2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions
Scientific paper
Interplanetary (IP) shocks disturb the magnetosphere-ionosphere system resulting in geosynchronous magnetic field changes and sudden impulses observed by ground-based magnetometers. We extend the implications of a previous statistical study and show that sudden impulses (SIs) can be used to estimate key parameters at L1 point and geosynchronous orbit, including the arrival time of an IP shock at L1 point, the change of the solar wind dynamic pressure across the shock, and the associated geosynchronous magnetic field changes near the subsolar region. Empirical formulae deduced from observations can be used to estimate certain IP shock characteristics and geosynchronous magnetic field changes from observed sudden impulse data observed on the ground with prediction efficiency as high as 89%. These estimates are useful for studying historic, pre-space era data, or if L1 and geosynchronous data are not available at some future time.
Kan Joseph R.
Li Handong
Richardson John D.
Wang Chenjie
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