On the Geoeffectiveness of Interplanetary Shocks

Details On the Geoeffectiveness of Interplanetary Shocks On the Geoeffectiveness of Interplanetary Shocks

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh62a10j&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH62A-10

Physics

2139 Interplanetary Shocks, 2164 Solar Wind Plasma

Scientific paper

We compare 70 forward Interplanetary shocks observed by the Wind spacecraft from 1995-2000 to examine the influence of shock parameters (speed, magnetic field, front normal direction, and obliquity angle) on the corresponding geomagnetic disturbances, measured by Dst index, which follow the shocks. The ACE spacecraft was used to verify the calculated parameters for 25 shocks from 1998-2000. At the time of the shock arrival at Earth, the future longetivity and the magnitude of the southward component of Bz, known as the dominant parameters dictating the severity of a magnetic storm, are not known and are hard to predict. We suggest that the obliquity angle, the angle between the shock normal direction and the upstream magnetic field vector, which is less suceptible to the fluctations than the magnetic field itself, might play an useful role in the forecasting of the severity of an impending geomagnetic storm.

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