On the origin of delta spots

Details On the origin of delta spots On the origin of delta spots

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...89...43t&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 89, Nov. 1983, p. 43-50.

Physics

20

Bipolarity, Solar Magnetic Field, Sunspots, Filtergrams, H Alpha Line, Magnetic Field Configurations, Penumbras, Sunspot Cycle, Umbras

Scientific paper

Mount Wilson sunspot drawings from 1966 through 1980 were used in conjunction with H-alpha filtergrams from Big Bear Solar Observatory to examine the origin of delta spots, spots with bipolar umbrae within one penumbra. Of the six cases studied, five were formed by the union of non-paired spots. They are either shoved into one another by two neighboring growing bipoles or by a new spot borne piggy-back style on an existing spot of opposite polarity. Proper motions of the growing spots take on curvilinear paths around one another to avoid a collision. This is the shear motion observed in delta spots (Tanaka, 1979). In the remaining case, the delta spot was formed by spots that emerged as a pair. The findings indicate no intrinsic differences in the formation or the behavior between delta spots and spots of normal magnetic configuration.

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