Magnetopause merging site asymmetries

Details Magnetopause merging site asymmetries Magnetopause merging site asymmetries

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90..341c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Jan. 1, 1985, p. 341-346. Previously announced in STAR as N84-26513.

Physics

24

Earth Magnetosphere, Geomagnetism, Magnetic Fields, Magnetopause, Solar Wind, Stagnation Point, Asymmetry, Atmospheric Models, Displacement, Equatorial Regions, Lines (Geometry), Magnetosheath, Predictions

Scientific paper

Regions where a draped model magnetosheath magnetic field is nearly antiparallel to a model geomagnetic field are shown to be asymmetric for an interplanetary magnetic field (IMF) at the garden hose angle, as suggested by Heelis. When the IMF has a southward component, the asymmetry favors the dawn region for both IMF polarities. The dusk region is favored when the IMF has a northward component. If the regions of antiparallel fields are assumed to be sites of maximum magnetic merging, then the asymmetry is consistent with observed seasonal variations of geomagnetic activity and with dawn-displaced magnetospheric phenomena. In the alternate merging geometry of a line passing through the subsolar region, the asymmetry is predominantly north-south rather than dawn-dusk. Merging line geometry is consistent with the seasonal variations but not with the dawn-displaced phenomena.

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