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Very Large Array-RATAN 600 observations of a solar active regionVLA-RATAN-600 observations of the sun around the partial solar eclipse in July 1990 are discussed. The relatively flat spectrum of the extended emission is attributed to the optically thin thermal bremsstrahlung of electrons trapped in a magnetic loop at coronal temperatures. Step-spectrum sunspot-associated emission is attributed to thermal gyroresonance radiation at different heights along the leg of a loop joining regions of positive magnetic polarity. Comparisons with predicted distributions of gyroresonance radio indicate that compact sunspot-associated sources lie at heights of 2500-17,500 km above the photosphere. Differences in the observed and predicted microwave emission suggest an inhomogeneous distribution of thermal plasma in the corona above the sunspot or the presence of localized flux tubes containing higher density plasma or nonpotential fields.
Document ID
19930027785
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Bogod, V. M.
(Special Astrophysical Observatory Pulkovo, Russia)
Gel'freikh, G. B.
(Central Astronomical Observatory Pulkovo, Russia)
Willson, R. F.
(NASA Headquarters Washington, DC United States)
Lang, K. R.
(Tufts Univ. Medford, MA, United States)
Opeikina, L. V.
(NASA Headquarters Washington, DC United States)
Shatilov, V.
(Special Astrophysical Observatory Nizhni Arkhyz, Russia)
Tsvetkov, S. V.
(Central Astronomical Observatory Pulkovo, Russia)
Date Acquired
August 15, 2013
Publication Date
October 1, 1992
Publication Information
Publication: Solar Physics
Volume: 141
Issue: 2
ISSN: 0038-0938
Subject Category
Solar Physics
Accession Number
93A11782
Funding Number(s)
CONTRACT_GRANT: AF-AFOSR-89-0147
CONTRACT_GRANT: NAGW-2383
CONTRACT_GRANT: NSF ATM-90-24506
Distribution Limits
Public
Copyright
Other

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