Flare loops heated by thermal conduction

Details Flare loops heated by thermal conduction Flare loops heated by thermal conduction

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...93...95r&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 93, June 1984, p. 95-104.

Physics

15

Conductive Heat Transfer, Coronal Loops, Plasma Heating, Solar Flares, Solar Temperature, Solar X-Rays, Emission Spectra, Energy Transfer, X Ray Spectra

Scientific paper

A flare observed with the Hard X-Ray Imaging Spectrometer was studied during its rise to maximum temperature and X-ray emission rate. Two proximate flare loops, of lengths 2.8 x 10 to the 9th cm and 1.1 x 10 to the 10th cm, rose to temperatures of 21.5 million K and 30 million K, respectively, in 30 s. Assuming equal heat flux F into each loop from a thermal source at the point where they met, a simple relationship between temperature T and loop length L is derived which gives a loop temperature ratio of 0.68, in close agreement with the observed ratio of 0.72. The observations imply that heating in each loop was maintained by a thermal flux of about 5 x 10 to the 9th ergs/sq cm per sec. It is suggested that conductive heating adequately describes the rise and maximum phase emissions in the loops, and that long flare loops reach higher temperatures than short loops during the impulsive phase because of an equipartition of energy between them at their point of interaction.

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