The Semi-annual Variation of Geomagnetic Activity.

Details The Semi-annual Variation of Geomagnetic Activity. The Semi-annual Variation of Geomagnetic Activity.

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm22b..06s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM22B-06

Physics

2784 Solar Wind/Magnetosphere Interactions

Scientific paper

This problem of long standing has had three classes of explanation: 1) the Axial mechanisms, 2) the Equinoctial mechanisms, and 3) the Russell-McPherron effect. Proponents of each mechanism have usual claimed exclusivity. It is becoming clear that they all have a grain of the truth. Mechanisms from all three classes seem to be operating at all times, the relative importance of each mechanism ever-changing, roughly regulated by the solar cycle. Typical average values being of the order of 10%, 70%, and 20% for the three classes, with the Equinoctial mechanisms clearly dominant. At any time the relative importance may shift so that any of the three classes may dominate. Our understanding of the influence of each class is improving to the extent that we can generally untangle the various contributions (although the physical processes behind the Equinoctial mechanisms remain obscure)

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