Variations in the strength of recurrent geomagnetic activity in solar cycles 11 to 21.

Details Variations in the strength of recurrent geomagnetic activity in solar cycles 11 to 21. Variations in the strength of recurrent geomagnetic activity in solar cycles 11 to 21.

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991piase.100...49r&link_type=abstract

Proc. Indian Acad. Sci., Earth Planet. Sci., Vol. 100, No. 1, p. 49 - 54

Physics

Scientific paper

From maximum entropy spectral analysis of short lengths of Aa indices of geomagnetic activity, the characteristics of the strength of the 27-day and 13.5-day signals for each of the solar cycles 11 to 21 are highlighted. It is shown that the 13.5-day signal is a near permanent feature in geomagnetic activity. The Hale-cycle (22 yr) effect could be seen in the average magnitude of the 27-day signal with greater strengths in the even cycles. No clear annual variation in the strength is noticed, contrary to some earlier known results.

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