Triggering of substorms by solar wind discontinuities

Details Triggering of substorms by solar wind discontinuities Triggering of substorms by solar wind discontinuities

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82...74k&link_type=abstract

Journal of Geophysical Research, vol. 82, Jan. 1, 1977, p. 74-86.

Mathematics

Probability

46

Magnetospheric Instability, Polar Substorms, Solar Activity Effects, Solar Wind, Sudden Storm Commencements, Auroral Electrojets, Interplanetary Magnetic Fields, Magnetic Signatures, Satellite Observation, Time Response

Scientific paper

The probability of triggering of polar substorms by a large-scale magnetospheric compression associated with a discontinuity in the solar wind has been examined statistically using ground magnetogram data, AE index data and satellite geomagnetic data on 125 sudden storm commencements observed during 1967-1970. The triggering probability was found to depend on the amplitude of the sudden storm commencement and on the degree of preceding AE activity. In almost all cases the triggering occurred when the B-Z component of the interplanetary magnetic field was negative or decreasing during the 30 min before the passage of the discontinuity. Transient geomagnetic responses with a time scale of Alfven wave propagation in the polar cap also depend on interplanetary magnetic field conditions.

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