The geomagnetic seasons in the auroral zone: dayside magnetopause reconnection versus solar illumination

Details The geomagnetic seasons in the auroral zone: dayside magnetopause reconnection versus solar illumination The geomagnetic seasons in the auroral zone: dayside magnetopause reconnection versus solar illumination

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm42a..01w&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM42A-01

Physics

2704 Auroral Phenomena (2407), 2724 Magnetopause, Cusp, And Boundary Layers, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

There are three mechanisms that are proposed to explain the geomagnetic seasons. The most widely accepted mechanism is the Russell-McPherron (R-M) effect, which attributes the dependence to seasonal changes in an external driver of geomagnetic activity, the dayside magnetopause reconnection rate. The second mechanism results from a dipole tilt modulation of dayside magnetopause reconnection that depends on season. The third process is based on seasonal changes in solar generated conductivity. Using data from auroral zone magnetometers over a full solar cycle, we show that the R-M effect does not explain any of the seasonal changes in either the amplitude of the auroral zone geomagnetic field or its variability. The seasonal changes are shown to be too large to be caused by the dipole tilt mechanism. The auroral zone magnetometer data in the eastward electrojet region are shown to be consistent with seasonal changes in solar--generated conductivity. In the midnight sector and westward electrojet region, geomagnetic activity variations are consistent with the solar insulation effect except for a hemisphere--dependent Spring--Fall asymmetry.

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