Solstitial and hemispherical asymmetry in the response of geomagnetic field

Details Solstitial and hemispherical asymmetry in the response of geomagnetic field Solstitial and hemispherical asymmetry in the response of geomagnetic field

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..295s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 295-300. Research supported by the Max C. Fleischman

Physics

3

Geomagnetism, Solar Activity Effects, Solstices, Solar Flares, Summer, Winter

Scientific paper

It is shown that the geomagnetic field is more prone to disturbances around the June solstice than around the December solstice, as evidenced from a larger enhancement in geomagnetic activity indices, ap, an, and as, following the onset of transient solar disturbances occurring in the thee-month period around June solstice than in the interval around the December solstice. Further, an asymmetry between the northern and southern hemisphere geomagnetic activity is shown to exist, independent of the level of the activity. This asymmetry, represented by (an - as)/(an + as)/2 shows a regular annual variation with a maximum of 60 percent around the June solstice and is almost absent around the December solstice.

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