Geomagnetic activity and the high latitude magnetic field of the Sun

Abstract

SMITH et al.1 using Pioneer 11 in 1976 did not observe any sector structure at the heliographic latitude of about +16°. At this latitude the field polarity was consistently directed away from the Sun. Its direction was in accord with the direction of the high-latitude magnetic field near the north pole of the Sun. This result, as well as indirect data2–4, shows that the high latitude solar field extends far into interplanetary space. The evidence for this is shown by the analysis of the yearly aa indices5,6 between 1868 and 1976. We find intensification of geomagnetic disturbances during those 11 yr periods when the extended solar magnetic field polarity in the northern hemisphere is away from the Sun.

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LIVSHITS, M., VALCHUK, T. & FELDSTEIN, Y. Geomagnetic activity and the high latitude magnetic field of the Sun. Nature 278, 241–243 (1979). https://doi.org/10.1038/278241a0

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