Kp index correlations with solar-wind parameters during the first and second stages of a recurrent geomagnetic storm

Details Kp index correlations with solar-wind parameters during the first and second stages of a recurrent geomagnetic storm Kp index correlations with solar-wind parameters during the first and second stages of a recurrent geomagnetic storm

Dec 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21.2139b&link_type=abstract

Planetary and Space Science, Volume 21, Issue 12, p. 2139-2147.

Computer Science

8

Scientific paper

The dependence of geomagnetic activity during a recurrent magnetic storm on the solar-wind magnetic field and plasma parameters has been studied. According to variations of solar-wind magnetic field strength B, a recurrent magnetic storm is divided into two stages: the first proceeding during the peak of B, and the second proceeding after the return of B to quiet level. The Kp index vs solar-wind parameters scattering diagrams for stages I and II differ significantly. In particular, the random scattering for stage I is much larger than for stage II. It was found that for stage I the Kp index correlates with B, with the sign and value of northsouth field component Bz and with the magnitude ΔB of field fluctuations, the situation being similar to that during sporadic magnetic storms, though the scale of the event is smaller. For stage II, the Kp index does not correlate with B, but strongly correlates with ΔB and weaker-with Bz. So geomagnetic activity at stage II is supported mainly by solar-wind magnetic field fluctuations. The dependence of the Kp index on plasma parameters sconcentration of protons n, bulk velocity v and temperature T) is weak for both stages.

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