Storms-substorms relationship monitored by magnetic fields measured at the geosynchronous orbit

Details Storms-substorms relationship monitored by magnetic fields measured at the geosynchronous orbit Storms-substorms relationship monitored by magnetic fields measured at the geosynchronous orbit

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51b1407l&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM51B-1407

Physics

2778 Ring Current, 2788 Magnetic Storms And Substorms (7954), 2790 Substorms

Scientific paper

In this study, we explore the possibility of monitoring the magnetic storm and substorm activities by the changes on the tilt angle or equatorial component of magnetic field measured at the geosynchronous orbit in the night-time sector. The magnetic tilt angle is a measure of thinning and diploarization associated with substorms. The magnetic tilt angle averaged over the storm main phase at the geosynchronous orbit is found to be almost a linear function of the minimum value of the magnetic storm index SymH. Since both the driven and unloading processes affect the tilt angle at the geosynchronous orbit, it is essential to determine the contribution of substorm unloading process in the study of storm-substorm relationship. The geosynchronous magnetic field and energetic particle data as well as the AL index are used to determine time interval of substorm diploarization. The contribution of substorm injections to the geomagnetic storm is estimated by the integration of substorm associated magnetic field dipolarization at the geosynchronous orbit during the storm main phase. Relationships between the estimated substorm contribution and the storm intensity are also examined.

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