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  • 1
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    Microwave Pulse Trains Observed Before and during a Solar Flare (1969)
    Institute of Physics
    Details
    Publication Date: 1969-11-01
    Print ISSN: 0004-637X
    Electronic ISSN: 1538-4357
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 2
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    Solar flare predictions and warnings (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The real-time solar monitoring information supplied to support SPARCS equipped rocket launches, the routine collection and analysis of 3.3-mm solar radio maps, short-term flare forecasts based on these maps, longer-term forecasts based on the recurrence of active regions, and an extension of the flare forecasting technique are summarized. Forecasts for expectation of a solar flare of class or = 2F are given and compared with observed flares. A total of 52 plage regions produced all the flares of class or = 1N during the study period. The following results are indicated: of the total of 21 positive forecasts, 3 were correct and 18 were incorrect; of the total of 31 negative forecasts, 3 were incorrect and 28 were correct; of a total of 6 plage regions producing large flares, 3 were correctly forecast and 3 were missed; and of 46 regions not producing any large flares, 18 were incorrectly forecast and 28 were correctly forecast.
    Keywords: SPACE RADIATION
    Type: NASA-CR-114511 , ATR-73(7265)-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Solar flare forecasts based on mm-wavelength measurements (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Solar radio temperature contour maps at a wavelength of 3.3 mm are analyzed to develop a method of forecasting solar flares of classes 1N and 1B. Fundamental to the analysis is the demonstration that most of the radio sources associated with the sunspot-plage systems are not spatially resolved by the radio telescope and, hence, only the peak temperature enhancements due to these local radio sources are employed. Evidence is presented indicating that flare-prone plage regions, which belong to recurrent families of flare-productive regions, exhibit a relationship between flare production and radio temperature characteristics considerably unlike that exhibited by virgin plage regions. The results are interpreted by means of graphs which permit the inference of class 1B or 1N flare probabilities based on the peak temperature enhancements measured at 3.3 mm. In particular, the forecast obtained is the probability that a given flare-prone plage region will produce a class 1B or 1N flare (two quoted probabilities) during the period of its disk transit.
    Keywords: SPACE RADIATION
    Type: NASA-CR-114510 , ATR-73(8102)-4
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Solar flare predictions and warnings (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The real-time solar monitoring information supplied to support SPARCS-equipped rocket launches, the routine collection and analysis of 3.3-mm solar radio maps, short-term flare forecasts based on these maps, longer-term forecasts based on the recurrence of active regions, and results of the synoptic study of solar active regions at 3.3-mm wavelength are presented. Forecasted flares in the 24-hour forecasts were 81% accurate, and those in the 28-day forecasts were 97% accurate. Synoptic radio maps at 3.3-mm wavelength are presented for twenty-three solar rotations in 1967 and 1968, as well as synoptic flare charts for the same period.
    Keywords: SPACE RADIATION
    Type: NASA-CR-114635
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    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
  • 6
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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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