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Title:
Simultaneous SMM flat crystal spectrometer and Very Large Array observations of solar active regions
Authors:
Lang, Kenneth R.; Willson, Robert F.; Smith, Kermit L.; Strong, Keith T.
Affiliation:
AA(Tufts University, Medford, MA), AB(Tufts University, Medford, MA), AC(Lockheed Research Laboratories, Palo Alto, CA), AD(Lockheed Research Laboratories, Palo Alto, CA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 15, 1987, p. 1035-1043. Research supported by the Lockheed Independent Research Program. (ApJ Homepage)
Publication Date:
11/1987
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Astronomical Spectroscopy, Solar Activity, Very Large Array (Vla), X Ray Astronomy, Astronomical Maps, Plasma Spectra, Solar Corona, Solar Maximum Mission, Solar X-Rays, Spectrometers
DOI:
10.1086/165798
Bibliographic Code:
1987ApJ...322.1035L

Abstract

High-resolution images of the quiescent emission from two solar active regions at 20 cm (VLA) and soft X-ray (SMM FCS) wavelengths are compared. There are regions where the X-ray coronal loops have been completely imaged at 20 cm wavelength. In other regions, the X-ray radiation was detected without detectable 20 cm radiation, and vice versa. The X-ray data were used to infer average electron temperatures of about 3-million K and average electron densities of about 2.5 x 10 to the 9th/cu cm for the X-ray emitting plasma in the two active regions. The thermal bremsstrahlung of the X-ray emitting plasma is optically thin at 20 cm wavelength. The 20 cm brightness temperatures were always less than T(e), which is consistent with optically thin bremsstrahlung. The low T(B) can be explained if a higher, cooler plasma covers the hotter X-ray emitting plasma. Thermal gyroresonance radiation must account for the intense 20 cm radiation near and above sunspots where no X-ray radiation is detected.

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