Physics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..105...87s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 105, May 1986, p. 87-99.
Physics
6
Microwave Emission, Solar Flares, Solar X-Rays, Maps, Ratios, Solar Temperature, Temperature Distribution
Scientific paper
Ten solar bursts were observed during the thermal phase using the Haystack radio telescope at 22 GHz. It is shown that these high frequency flux observations, when compared with soft X-ray band fluxes, give useful information about the temperature profile in the flare loops. The microwave and X-ray band fluxes provide determinations of the maximum loop temperature, the total emission measure, and the index delta of the differential emission measure. The special case of an isothermal loop has been considered previously by Thomas et al. (1985), and the present paper confirms their diagnostic calculations for the GOES X-ray bands, but finds that the observed flare loops departed significantly from the isothermal regime. The present results (delta = 1-3.5) imply that, during the late phases of flares, condensation cooling competes with radiative cooling. Further, the results appear to be in good agreement with previous deductions from XUV rocket spectra.
Erskine F. T.
Kundu Mukul R.
Schmahl Ed. J.
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