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High resolution interferometric observations of the solar limb at 4.9 and 10.7 GHz during the solar eclipse of October, 1977The radial intensity profile of the quiet solar limb has been measured at high spatial resolution using the VLA at 4.9 GHz and the Owens Valley solar interferometer at 10.7 GHz during the partial solar eclipse of October 12, 1977. The spatial resolution (13.8 arcsec at 4.9 GHz and 7.4 arcsec at 10.7 GHz) was provided primarily by the lunar limb. Substantial limb brightening at 4.9 GHz was found with a peak brightness temperature corresponding to an 80% increase over the disk value, and a possible small limb enhancement at 10.7 GHz. The results are consistent with a simple model consisting of a uniform disk (provided by a thoroughly roughened transition zone) overlaid by a corona in hydrostatic equilibrium with a density of 5 x 10 to the 8th at its base. The lack of the secant-like variation in the microwave intensity from center to limb is explained by a corona contained in loop structures rather than in spherically symmetric layers.
Document ID
19820026620
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Marsh, K. A.
(California Inst. of Tech. Pasadena, CA, United States)
Hurford, G. J.
(California Inst. of Tech. Pasadena, CA, United States)
Zirin, H.
(California Institute of Technology Pasadena, CA, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1981
Publication Information
Publication: Astronomy and Astrophysics
Volume: 94
Issue: 1, Ja
Subject Category
Solar Physics
Accession Number
82A10155
Funding Number(s)
CONTRACT_GRANT: NSF ATM-76-21132
CONTRACT_GRANT: NGR-05-002-034
CONTRACT_GRANT: NSF ATM-76-80782
Distribution Limits
Public
Copyright
Other

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