Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..132..247t&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 132, April 1991, p. 247-256.
Physics
11
Magnetic Signatures, Solar Cycles, Solar Magnetic Field, High Resolution, Limb Darkening, Magnetic Flux, Polarity, Spatial Distribution
Scientific paper
The results of ongoing high-resolution magnetograph observations of the polar magnetic fields at the Big Bear Solar Observatory are presented and discussed. Specific attention is given to studying the evolution of polar fields during the expected polarity reversal when cycle 22 exceeds its maximum phase, as well as establishing polar magnetic field parameters. The use of 2 arcsec resolution allows the resolution of concentrated fields of more than 100 G. No reversal of the more than 70 degree net polar flux was shown. Decreasing field intensity in the old polarity fluctuations is indicated in the lower latitudes of both poles. The net average longitudinal polar fields are 1-2 G, for those above 50 degrees. These indicators are shown to be similar to those which preceded the reversals in cycles 19 and 20. The polar fields are compared to the equatorial limb, and found to be similar. This, and the nearly constant result of correcting flux density for limb darkening and projection effects, suggest that in spite of their high latitudes, the field strength and distribution of these polar fields are similar to those found in other parts of the sun.
Tang Frances
Wang Haimin
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