The semiannual variation in the magnetic activity indices Aa and Ap

Details The semiannual variation in the magnetic activity indices Aa and Ap The semiannual variation in the magnetic activity indices Aa and Ap

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..297g&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, March 1984, p. 297-305.

Computer Science

32

Annual Variations, Geomagnetism, Indexes (Ratios), Secular Variations, Modulation, Sunspots

Scientific paper

The technique of complex demodulation is used to examine the long-term modulation of the semiannual variation in planetary magnetic activity as characterized by the Aa index for 1868-1980 and the Ap index for 1932-1980. From the phase results, strong support is found for an 'equinoctial' mechanism for the semiannual variation. The amplitude shows a quasi-11-year modulation for most of the period of analysis and a pronounced increase over the years 1938-1966, approximately. Comparison of the long-term modulation of the semiannual variation in activity with that of the occurrence of stormy days suggests that the semiannual modulation is energy dependent, being more effective with increasing energy.

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