Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....72..171l&link_type=abstract
Astronomy and Astrophysics, vol. 72, no. 1-2, Feb. 1979, p. 171-176. Consiglio Nazionale delle Ricerche
Astronomy and Astrophysics
Astrophysics
3
Solar Flares, Solar Temperature, Solar X-Rays, Stellar Models, Temperature Distribution, Laplace Transformation, Satellite Observation, Solar Spectra, Thermal Plasmas
Scientific paper
A method is described whereby the Laplace transform of a broadband X-ray photometer signal is used to obtain information on the temperature distribution in a solar-flare plasma. The method is applied to determine the differential-emission-measure vs temperature distribution of a solar X-ray flare observed by the Solrad 11A satellite. The results show that: (1) broadband photometers operating in the 1-16-A range provide reliable information on the differential-emission-measure vs temperature distribution in the outer regions of a solar flare; (2) the reliability of information on the differential-emission-measure distribution in a flare core depends on flux measurements above 10 keV; (3) a flare core attains its maximum temperature in the first few minutes of the event just as the peak of the associated radio event occurs; (4) the evolution of the observed flare event can be described in terms of a rapid expansion of the flare region accompanied by a slow decrease in temperature; and (5) the analytical form selected for the Laplace transform may not provide an adequate description of the hot flare core.
Landini Massimo
Monsignori Fossi Brunella C.
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