Solar cycle and geomagnetic activity: a review for geophysicists. Part 2. The solar sources of geomagnetic activity and their links with sunspot cycle activity.

Details Solar cycle and geomagnetic activity: a review for geophysicists. Part 2. The solar sources of geomagnetic activity and their links with sunspot cycle activity. Solar cycle and geomagnetic activity: a review for geophysicists. Part 2. The solar sources of geomagnetic activity and their links with sunspot cycle activity.

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..579s&link_type=abstract

Annales Geophysicae, Vol. 7, No. 6, p. 579 - 593

Physics

30

Solar Activity Cycles: Geomagnetic Field, Interplanetary Matter: Solar Wind

Scientific paper

After a short review of the various mechanisms at work in the «solar machinery», the authors establish the links taking place between the spatial distribution in the interplanetary medium of the solar wind velocity and the two «key parameters» of the solar poloidal field, namely the intensity of the solar dipole and the «thickness» of the slow wind sheet. Then they consider a model of poloidal field cycle established according to two series of solar data: the magnetic field on the disk and the coronal densities. According to the cyclic behaviour of the poloidal field topology, the related distribution, in the ecliptic plane, of the wind velocity is the main origin of the geomagnetic activity cycle as well as of the separate properties of the quiet and disturbed day patterns. Therefore only the shock activity which results from a series of separate events shows some link not yet clear with the sunspot activity in progress. The time profile of the geomagnetic activity is easily explained post facto when the sunspot maximum number of the related sunspot cycle is known.

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