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  • Other Sources  (2)
  • SOLAR PHYSICS  (2)
  • 1975-1979  (1)
  • 1970-1974  (1)
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  • Other Sources  (2)
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  • 1975-1979  (1)
  • 1970-1974  (1)
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  • 1
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    Unknown
    Pre-flare association of magnetic fields and millimeter-wave radio emission (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Observations of radio emission at 3.3 mm wavelength associated with magnetic fields in active regions are reported. Results of more than 200 regions during the years 1967-1968 show a strong correlation between peak enhanced millimeter emission, total flux of the longitudinal component of photospheric magnetic fields and the number of flares produced during transit of active regions. For magnetic flux greater than (10 to the 21st power) maxwells flares will occur and for flux of (10 to the 23rd power) maxwells the sum of the H-alpha flare importance numbers is about 40. The peak millimeter enhancement increases with magnetic flux for regions which subsequently flared. Estimates of the magnetic energy available and the correlation with flare production indicate that the photospheric fields and probably chromospheric currents are responsible for the observed pre-flare heating and provide the energy of flares.
    Keywords: SOLAR PHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Millimeter radio evidence for containment mechanisms in solar flares (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Recent theories of solar flares are reviewed with emphasis on the aspects of pre-flare heating. The heating evident at 3.3-mm wavelength is analyzed in the form of daily maps of the solar disk and synoptic maps compiled from the daily maps. It is found that isotherms defining antenna temperature enhancements of 340 K correspond in shape and location to facular areas reported by Waldmeier. Maximum enhancements occur over sunspots or near neutral lines of the longitudinal magnetic fields which indicates heating associated with chromospheric currents. These enhancements are correlated with flare importance number and are observed to increase during several days preceding flaring. This evidence for a containment mechanism in the chromosphere is collated with current theories of solar flares.
    Keywords: SOLAR PHYSICS
    Type: Coronal disturbances; Symposium, Surfer''s Paradise; Sep 07, 1973 - Sep 11, 1973; Queensland; Australia
    Format: text
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    NASA TECHNICAL REPORTS
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