Sources of Geomagnetic Activity and Geomagnetic Storms for Solar Minimum and Maximum Conditions During 1972-2000

Details Sources of Geomagnetic Activity and Geomagnetic Storms for Solar Minimum and Maximum Conditions During 1972-2000 Sources of Geomagnetic Activity and Geomagnetic Storms for Solar Minimum and Maximum Conditions During 1972-2000

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh51a04r&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH51A-04

Physics

2102 Corotating Streams, 2111 Ejecta, Driver Gases, And Magnetic Clouds, 2788 Storms And Substorms

Scientific paper

Continuing our recent study of the solar wind sources of geomagnetic activity over the solar cycle, we have determined the contribution of solar wind structures (coronal mass ejection (CME) - related, high-speed streams, and slow solar wind) to long-term averages of the aa geomagnetic index over an interval of nearly three solar cycles. We have also identified the structures responsible for geomagnetic storms of various strength. The most intense storms (defined by Kp) at both solar minimum and solar maximum are almost all ( ~97%) generated by transient structures associated with CMEs. Weaker storms are preferentially associated with streams at solar minimum and with CMEs at solar maximum, reflecting the change in the structure of the solar wind between these phases of the solar cycle. Slow solar wind generates a small fraction of the weaker storms at solar minimum and maximum. We also determine the size distributions of Kp for each solar wind component. These results help to understand the physical processes underlying geomagnetic activity indices which may be of significance in understanding longer-term trends in these indices.

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