The geomagnetic field as a probe for the solar dipole field

Details The geomagnetic field as a probe for the solar dipole field The geomagnetic field as a probe for the solar dipole field

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978sval....4..277v&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 4, Nov. 1978, p. 515-519.) Soviet Astronomy Letters, vol. 4, Nov.-Dec. 1978, p. 277-280

Astronomy and Astrophysics

Astronomy

Geomagnetism, Solar Activity Effects, Solar Magnetic Field, Solar Terrestrial Interactions, Annual Variations, Interplanetary Magnetic Fields, Magnetic Dipoles, Solar Cycles

Scientific paper

The seasonal dependence of Mayaud's geomagnetic-activity index aa is examined for times of minimum of even- and odd-numbered 11-yr solar activity cycles from 1868 to 1976. At even minima, aa peaks in March and September and is smallest in June and December; at odd minima its behavior is less regular. For 1954, 1965, and 1976 the variation of aa conforms to the sector structure of the interplanetary magnetic field. This effect results from the motion of the earth through the interplanetary field, an extension of the solar field which similarly varies with a period of about 22 yr.

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