Initial Phase Electrodynamics of the July 1991 Magnetic Storm: Some Implications for Space Weather Prediction

Details Initial Phase Electrodynamics of the July 1991 Magnetic Storm: Some Implications for Space Weather Prediction Initial Phase Electrodynamics of the July 1991 Magnetic Storm: Some Implications for Space Weather Prediction

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42c12b&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM42C-12

Physics

2409 Current Systems (2708), 2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2788 Storms And Substorms

Scientific paper

An interplanetary disturbance impacted with the magnetosphere at about 1636 UT on July 8, 1991. The solar wind compressed the magnetopause earthward of geosynchronous orbit where it remained for more than three hours. Effects of the SSC compressional wave were detected by CRRES in the inner magnetosphere as a bipolar electric field structure and by ground magnetometers as rapid increases in the horizontal component of the Earth's magnetic field. Within a few minutes of the SSC, DMSP satellites witnessed an increase in the cross polar cap potential to >100 kV and a 20-fold increase in the flux of precipitating auroral electrons. Effects of an intense DP 2 current system were detected by magnetometers around the Earth. Measurements at Guam and on CRRES show that the electric fields extended to the equatorial ionosphere and throughout the inner magnetosphere. A DMSP satellite encountered equatorial plasma bubbles during two consecutive orbits. The bubbles appear to have been triggered by penetration electric fields of the storm's initial phase. If this is correct, electric fields associated with DP 2 currents may contribute to the general stability of the equatorial ionosphere. We consider the possibility of using interplanetary data to predict occurrences of equatorial plasma bubbles.

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