Geomagnetic activity for northward interplanetary magnetic fields - Am index response

Details Geomagnetic activity for northward interplanetary magnetic fields - Am index response Geomagnetic activity for northward interplanetary magnetic fields - Am index response

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1065s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, July 1990, p. 1065-1068.

Physics

6

Earth Magnetosphere, Interplanetary Magnetic Fields, Kelvin-Helmholtz Instability, Magnetic Anomalies, Solar Wind Velocity, Diurnal Variations, Dynamic Pressure, Energy Storage, Magnetic Field Configurations, Magnetic Storms

Scientific paper

The Am index is used to study the response of the magnetosphere to northward IMF. It is shown that most of the observed increase in activity can be explained by a correlation of the solar wind dynamic pressure with the IMF field strength, such that the Am index varies only slightly with northward IMF strength when the solar wind dynamic pressure is held constant. There remains a smaller response of Am to solar wind velocity, which is usually attributed to a viscous interaction of the solar wind with the magnetosphere such as through the Kelvin-Helmholtz instability. The diurnal variation of Am during northward fields is also examined. While the Kelvin-Helmholtz instability may play some role in energy transfer into the magnetosphere and the resultant geomagnetic activity, this role is much less than that of dynamic pressure fluctuations and no evidence is found that it by itself plays any role in the annual variation of the diurnal variation of geomagnetic activity.

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