EUV continua of solar flares 1420-1960 A

Details EUV continua of solar flares 1420-1960 A EUV continua of solar flares 1420-1960 A

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..645c&link_type=abstract

Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 645-647, 649-654.

Astronomy and Astrophysics

Astrophysics

29

Faculae, Far Ultraviolet Radiation, Solar Flares, Solar Spectra, Brightness Temperature, Skylab Program, Stellar Spectrophotometry

Scientific paper

Measurements of absolute continuum intensities in the wavelength range 1420-1960 A are presented for the SN subflare of 1973 August 9 and the 2B flare of 1973 September 7, observed from the NRL spectrograph aboard Skylab. Continuum measurements are also given for two active-region plages, which are used for background nonflaring levels. Major enhancement of the flare continuum intensity above the plage backgrounds occurs in the Si I 3P and 1D continua. The observed brightness-temperature minimum of the plages is approximately 310 K above the quiet-sun minimum, and occurs at longer wavelength. The earliest flare brightness-temperature minima are approximately 200 K above the plage minimum, and also at longer wavelength. The observed decay time of the flare brightness temperature, which is comparable to the Solrad 9 X-ray decay time, is much longer than the Ulmschneider radiative relaxation time for the 1973 September 7 flare and marginally longer for the 1973 August 9 flare, suggesting continuous excess heating of the plage temperature minimum region throughout the period of our flare observations.

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