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  • SOLAR PHYSICS  (2)
  • X-Rays: Stars
  • 1985-1989  (2)
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  • 1
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    Unknown
    Two-frequency imaging of microwave impulsive flares near the solar limb (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: VLA observations of two impulsive microwave and hard X-ray flares close to the solar limb on November 21 and 22, 1981 are presently interpreted in terms of an inhomogeneous flare volume, with the magnetic field strength and orientation varying with position both transverse to, and along, the line-of-sight. The 15 GHz radiation of the flares on both days may be due to electrons of E = 300 keV in weak nonthermal tail; the absence of 4.9 GHz radiation from these sources is attributed to absorption along the ray path from the flare to the earth, on the basis of the fact that thermal bremsstrahlung and gyrosynchrotron radiation mechanisms generate more low than high frequency radiation.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 300; 438-441
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Variation of the quiet sun at 21 cm - 1981-1987 (1988)
    In:  Other Sources
    Details
    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
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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