Cyclic variations of the polar coronal hole

Details Cyclic variations of the polar coronal hole Cyclic variations of the polar coronal hole

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...70..251w&link_type=abstract

Solar Physics, vol. 70, Apr. 1981, p. 251-258.

Physics

55

Coronal Holes, Solar Corona, Sunspot Cycle, Faculae, Isophotes, Line Spectra, Polar Regions, Solar Prominences

Scientific paper

The extension of the polar coronal holes has been studied for four cycles (1940-1978), using the observations of the corona line 530.3 nm. For about 7 years of each cycle, including sunspot minimum, the polar hole exists permanently and has a diameter of about 40 deg or even more. For about 3 years around sunspot maximum, no polar hole exists. The boundary of the hole is flanked at a distance of 10 deg by the polar zone of the corona and at one of 20 deg by that of the prominences. In the polar caps, as far as they are occupied by the holes, polar photospheric faculae and the well-known plumes of the polar corona are found, and the polar crown of prominences, encircling the polar hole, is the belt where the reversal of the magnetic polarity takes place.

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