Solar radio centers and Interplanetary sector structures in connection with recurrent geomagnetic storms

Details Solar radio centers and Interplanetary sector structures in connection with recurrent geomagnetic storms Solar radio centers and Interplanetary sector structures in connection with recurrent geomagnetic storms

Dec 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970jgr....75.6991l&link_type=abstract

Journal of Geophysical Research, vol. 75, issue 34, pp. 6991-6998

Physics

2

Scientific paper

The superposed epochs method was used to compute the mean geomagnetic activity as given by the Kp indices for 10 days before and after the central meridian passage (CMP) across the Sun of centers of activity having given rise to at least 2 large centimetric type IV solar radio bursts during 1 passage on the visible hemisphere, termed repetitive (R) centers. Similarities are found in each of the 4 last half solar cycles, for a total duration extending from 1949 to 1967, given substantial evidence for a correlation between R centers and recurrent geomagnetic storms. Minimums in geomagnetic activity for the days relative to the CMP of R centers for each of the 4 last half solar cycles are explained theoretically by the approach near the Earth of a boundary of an interplanetary sector, whereas maximums in the geomagnetic activity are linked theoretically to specific areas on the solar surface, situated 1 or 2 days (out of the 27-day solar rotation)behind the leading edge of a unipolar magnetic region (UMR) or its corresponding ghost UMR, having each an associated interplanetary sector structure. These specific areas of the solar surface could well be the so-called M-regions responsible for recurrent geomagnetic storms, through the mechanism of interplanetary sector structures.

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