Solar cycle dependence of periodic variations in geomagnetic Kp-index

Details Solar cycle dependence of periodic variations in geomagnetic Kp-index Solar cycle dependence of periodic variations in geomagnetic Kp-index

Apr 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22..537a&link_type=abstract

Planetary and Space Science, Volume 22, Issue 4, p. 537-544.

Physics

4

Scientific paper

The geomagnetic Kp-index data for the 1932-1969 period have been investigated by means of a modified power spectrum technique on the basis of overlapping 2-yr intervals. The observed 27-, and 13.5-day periodicities show an obvious solar cycle dependence through the whole period concerned. Also, periodicities in the range of 9-4 days have been observed through years of minimum and decreasing phases of solar activity. The periodicities observed are found to be related to the existence of variations in the interplanetary medium structure which modulates the geomagnetic activity.

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