Computer Science – Numerical Analysis
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..127...65s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 127, May 1990, p. 65-94. Research supported by SERC.
Computer Science
Numerical Analysis
5
Coronal Loops, Solar Magnetic Field, Solar Temperature, Thermodynamic Equilibrium, Numerical Analysis, Solar Physics, Solar Wind
Scientific paper
A coronal magnetic arcade can be thought of as consisting of an assembly of coronal loops. By solving equations of thermal equilibrium along each loop and assuming a base temperature of 20,000 K, the thermal structure of the arcade can be found. By assuming a form for the plasma pressure in the arcade, the possible thermal structures can be shown to depend on three parameters. Arcades can contain 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. For certain arcades, there exist regions where more than one kind of loop is possible. If the parameters describing the arcade are varied, it is possible for nonequilibrium to occur when a type of solution ceases to exist. For example, hot or warm loops can cease to exist so that only cool solutions are possible when the arcade size or pressure is decreased, while warm or cool loops may give way to hot-cool loops when the heating is reduced or the pressure is increased.
Priest Eric R.
Steele Colin D. C.
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