Interplanetary shock characteristics and associated geosynchronous magnetic field variations estimated from sudden impulses observed on the ground

Details Interplanetary shock characteristics and associated geosynchronous magnetic field variations estimated from sudden impulses observed on the ground Interplanetary shock characteristics and associated geosynchronous magnetic field variations estimated from sudden impulses observed on the ground

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11509215w&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A9, CiteID A09215

Physics

1

Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Discontinuities (7811), Magnetospheric Physics: Forecasting (1922, 7924, 7964)

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 some parameters at the L1 point and geosynchronous orbit, including the change of the square root of solar wind dynamic pressure across the shock and the associated geosynchronous magnetic field changes near the subsolar region. It should be pointed out that the relationship between magnetospheric field change and SIs amplitude and the solar wind dynamic pressure is not a single valued one, but a statistical relationship is useful in cases when interplanetary data are not available. Empirical formulae deduced from observations can be used to estimate certain IP shock characteristics and geosynchronous magnetic field changes from sudden impulse data observed on the ground, with the prediction efficiency as high as 90% and 86%, respectively. These estimates are useful for studying historic, pre-space era data or if the L1 and geosynchronous data are not available at some future time.

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