Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..134...73s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 134, July 1991, p. 73-97. Research supported by SERC and EEC.
Physics
2
Coronal Loops, Solar Corona, Solar Magnetic Field, Thermodynamic Equilibrium, Radiant Cooling, Solar Temperature
Scientific paper
A coronal magnetic arcade can be though of as consisting of an assembly of coronal loops. By solving equations of isobaric thermal equilibrium along each loop and assuming a base temperature of 20,000 K, the thermal structure of the arcade can be found. The possible thermal equilibria can be shown to depend on two parameters representing the ratios of cooling (radiation) to conduction, and heating to cooling, respectively. Arcades can contain four types of loops: hot loops with summits hotter than 400,000 K; cool loops at temperatures less than 80,000 K along their lengths; hot-cool loops with cool summits and cool footpoints but hotter intermediate portions; and warm loops, cooler than 80,000 K along most of their lengths but with summits as hot as 400,000 K. Two possibilities for coronal heating are considered, namely a heating that is independent of magnetic field and a heating that is proportional to the square of the local magnetic field.
Priest Eric R.
Steele Colin D. C.
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