Physics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..385a&link_type=abstract
Astrophysical Journal, Part 1, vol. 241, Oct. 1, 1980, p. 385-393.
Physics
37
High Temperature Plasmas, Radiative Transfer, Solar Corona, Solar Flares, Solar Wind, Cooling, Coronal Loops, Density Distribution, Plasma Temperature, Solar Physics, Solar Temperature
Scientific paper
Recent observations of some compact flares indicate that the differential emission measure, q, of flare coronal and transition region plasma has a much steeper dependence on temperature than in nonflare regions. It is noted that this result is not compatible with models for a flare loop in which conduction to the chromosphere dominates the cooling, even in the case where the loop has a large divergence in its cross-sectional area. Only by a combination of many loops is it possible to reproduce the observations. Hence, models in which radiation dominates the evolution are investigated. It is found that the radiative models predict that q varies as T to the power (l + 1) where l measures the dependence of the radiative loss coefficient on temperature. It is concluded that the radiative models are also incapable of explaining the observations (unless, again, a combination of many loops is postulated) and it is suggested that large mass motions with velocities of the order of the sound speed may be required.
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