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Photometric measurements of solar irradiance variations due to sunspotsA photometric telescope constructed to obtain photometric sunspot areas and deficits on a daily basis is described. Data from this Cartesian full disk telescope (CFDT) are analyzed with attention given to the period between June 4 and June 17, 1985 because of the availability of overlapping sunspot area and irradiance deficit data from high-resolution digital spectroheliograms made with the San Fernando Observatory 28 cm vacuum solar telescope and spectroheliograph. The CFDT sunspot deficits suggest a substantial irradiance contribution from faculae and active region plage.
Document ID
19890059304
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Chapman, G. A.
(San Fernando Observatory El Segundo, CA, United States)
Herzog, A. D.
(San Fernando Observatory El Segundo, CA, United States)
Laico, D. E.
(San Fernando Observatory El Segundo, CA, United States)
Lawrence, J. K.
(San Fernando Observatory El Segundo, CA, United States)
Templer, M. S.
(San Fernando Observatory El Segundo, CA, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 343
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
89A46675
Funding Number(s)
CONTRACT_GRANT: NAGW-688
CONTRACT_GRANT: NSF AST-84-01145
CONTRACT_GRANT: NSF AST-86-03309
Distribution Limits
Public
Copyright
Other

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