Observations of the Polar Magnetic Fields During the Polarity Reversals of Cycle 22

Details Observations of the Polar Magnetic Fields During the Polarity Reversals of Cycle 22 Observations of the Polar Magnetic Fields During the Polarity Reversals of Cycle 22

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000soph..191....1s&link_type=abstract

Solar Physics, v. 191, Issue 1, p. 1-19 (2000).

Physics

18

Scientific paper

The Mount Wilson synoptic magnetic data for the period September 1987 through March 1996 are completely revised and used to provide polar plots of the solar magnetic fields for both hemispheres. This period, from Carrington rotations 1793 to 1906, covers the reversals of the polar magnetic fields in cycle 22. Comparison of our plots with the presently available Hα filtergrams for this period shows that the polarity boundaries are consistent in these two data sets where they overlap. The Mount Wilson plots show that the polar field reversals involve a complex sequence of events. Although the details differ slightly, the basic patterns are similar in each hemisphere. First the old polarity becomes isolated at the pole, then shortly thereafter, the isolation is broken, and the polar field includes unipolar regions of both polarities. The old polarity then reclaims the polar region, but when the isolation of this field is established for a second time, it declines in both area and strength. We take the reversal to be complete when the old polarity field is no longer observed in the Mount Wilson plots. With this criterion we find that the polar field reversal is completed in the north by CR 1836, i.e., by December 1990, and in the south by CR 1853, i.e., March 1992.

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