The vernal-autumnal asymmetry in the seasonal variation of geomagnetic activity

Details The vernal-autumnal asymmetry in the seasonal variation of geomagnetic activity The vernal-autumnal asymmetry in the seasonal variation of geomagnetic activity

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..111t&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, Feb. 1989, p. 111-118.

Physics

9

Annual Variations, Magnetic Variations, Solar Terrestrial Interactions, Interplanetary Magnetic Fields, Magnetoactivity, Solar Magnetic Field

Scientific paper

In intervals in which the polarity of the main solar dipole (MSD) field is stabilized, a 12-month wave occurs in geomagnetic activity (indices aa, Ap, Dst) with its maximum in one of the equinocial periods. Whether the vernal or the autumnal maximum is greater depends on the polarity of the MSD; the existence of the wave may be explained by the north-south asymmetry in the MSD field. The results favor the southward component of the IMF as the decisive factor for geomagnetic activity.

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