Observations of the reappearance of polar coronal holes and the reversal of the polar magnetic field

Details Observations of the reappearance of polar coronal holes and the reversal of the polar magnetic field Observations of the reappearance of polar coronal holes and the reversal of the polar magnetic field

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...92..109w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 92, May 1984, p. 109-132.

Astronomy and Astrophysics

Astronomy

55

Coronal Holes, Magnetic Field Inversions, Magnetic Poles, Solar Cycles, Solar Magnetic Field, Sunspot Cycle, Dynamo Theory, Photosphere, X Ray Astronomy, X Ray Imagery

Scientific paper

Observational data relating to the evolution of the polar magnetic field around sunspot maximum is examined. Particular emphasis is given to coronal hole observations performed during the last two solar maxima. Long-term averages of the latitudinal dependence of the photospheric magnetic field and the evolutionary pattern of the polar crown filaments are used to trace the poleward motion of the reversal of the large-scale field and are compared to the redevelopment of polar holes. Within the context of phenomenological models of the solar cycle, it is concluded that: (1) the process of polarity reversal and redevelopment of polar holes is discontinuous, with surges of flux of old-cycle polarity interrupting the poleward migration of new-cycle flux; (2) contrary to the Babcock (1961) hypothesis, the polar crown disappears months after the magnetic pole reversal; and (3) the observations support suggestions of a poleward meridional flow around solar maximum that cannot be accounted for by Leighton-type (1964) diffusion.

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