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Variation of the quiet sun at 21 cm - 1981-1987 (1988)

Bastian, T. S. ; Dulk, G. A.

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Publication Date: 2019-07-13

Description: The sun was imaged at a wavelength of about 21 cm during 1981-1987 using the VLA, the Green Bank 91-m telescope, the Arecibo 305 m telescope, and powerful maximum entropy image reconstruction techniques. There was a systematic decrease in the quiet sun's brightness temperature at 21 cm as the sun declined from sunspot maximum to sunspot minimum; this was accompanied by a systematic decrease in the sun's radius. The two-fold decrease in the electron number density in the solar transition region and low corona could have been the cause of these variations.

Keywords: SOLAR PHYSICS

Type: Sacramento Peak Summer Symposium on Solar and Stellar Coronal Structure and Dynamics; Aug 17, 1987 - Aug 21, 1987; Sunspot, NM; United States

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