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On the origin of delta spotsMount 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.
Document ID
19840038141
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tang, F.
(Big Bear Solar Observatory Pasadena, CA, United States)
Date Acquired
August 12, 2013
Publication Date
November 1, 1983
Publication Information
Publication: Solar Physics
Volume: 89
ISSN: 0038-0938
Subject Category
Solar Physics
Accession Number
84A20928
Funding Number(s)
CONTRACT_GRANT: AF-AFOSR-82-0018
CONTRACT_GRANT: NGL-05-002-034
Distribution Limits
Public
Copyright
Other

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