Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248.1117m&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Sept. 15, 1981, p. 1117-1125.
Astronomy and Astrophysics
Astrophysics
13
Conductive Heat Transfer, Solar Flares, Solar Temperature, Solar X-Rays, Spectrum Analysis, X Ray Spectra, Emission Spectra, Line Spectra, Radiative Heat Transfer, Solar Corona
Scientific paper
Thirteen X-ray line spectra in the 7.8-23.0 A range, acquired during a solar flare that peaked at 2326 UT on Mar. 31, 1979, are analyzed. The data, which include fluxes of lines excited throughout the 2-18 million K temperature range present in the coronal flare, show that the flare emission began to decrease 500 sec or less after the broadband X-ray flux peaked. Collision strengths available for a number of the observed lines are used to construct the differential emission measure for the temperature range cited. While a lack of information on electron densities prevents a detailed study of flare energetics, the total emission measure for temperatures above two million K, the radiative loss rate, and the density at two million K, are all derived from the data. Conductive cooling is found to be more important than radiative cooling for coronal temperatures in this flare.
Landecker P. B.
McKenzie David L.
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