The role of the spiral spots in solar activity in October 1972

Details The role of the spiral spots in solar activity in October 1972 The role of the spiral spots in solar activity in October 1972

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977acasn..18..143d&link_type=abstract

Acta Astronomica Sinica, vol. 18, Dec. 1977, p. 143-157. In Chinese, with abstract in English.

Other

Astronomical Photography, Solar Corona, Solar Flares, Solar Prominences, Sunspots, Fine Structure, Morphology, Penumbras, Solar Magnetic Field, Umbras

Scientific paper

The photographic features of the 192 knots of 68 flares and some prominences in the McMath 12094 region observed at Yunnan Observatory and Peking Observatory are presented. From a correlation analysis of the morphology of these flares and prominences with the fine structures of sunspot groups in this region previously obtained conclusions were verified. The earliest flare activity in this region appeared over the large preceeding spot which had higher energetic state of the twisted magnetic field than all other spots of the group. It rapidly developed to the following spots and then shifted to the area outside the spots. Flare activity near the large spot A started inside the magnetic tube of the twisted field, synchronous with the untwisting of spiral penumbral feature. The flare knots shifted from the neighborhood of the umbra to outside the penumbra. The large spiral spot A has been discovered as a strong attraction center under the largest coronal prominence in the active region. This shows that the coronal prominence is built by a powerful current contracting up in the corona.

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