Geomagnetic activity and the high latitude magnetic field of the sun

Details Geomagnetic activity and the high latitude magnetic field of the sun Geomagnetic activity and the high latitude magnetic field of the sun

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.278..241l&link_type=abstract

Nature, vol. 278, Mar. 15, 1979, p. 241-243.

Computer Science

Geomagnetism, Magnetic Effects, Solar Activity Effects, Solar Magnetic Field, Solar Terrestrial Interactions, Magnetic Disturbances, Polarity, Solar Corona, Solar Wind, Sunspot Cycle

Scientific paper

The effects of the high latitude solar magnetic field on geomagnetic activity are discussed, taking into account variations of solar magnetic field polarity. The solar magnetic field has been shown to vary in 22 year cycles, with a maximum occurring in the center of the cycle, at a time when solar activity is at a minimum and the field is directed away from the photosphere. It has been found that the interplanetary magnetic field is large enough to have a geomagnetic effect, and it is concluded that geomagnetic activity should increase at the ends of those solar activity cycles during which the magnetic field is at a maximum and is directed away from the sun (even cycles). The aa index of geomagnetic activity is compared with Wolf number for solar cycles 11 through 20 and it is found that at sunspot minima, geomagnetic activity is greater at the ends of even cycles than odd cycles. The explanation offered is that at sunspot minima, the temperature and density of the high latitude solar corona are lower and the solar wind does not affect the magnetic field allowing it to extend far into interplanetary space.

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