The nonequilibrium ionization of solar flare coronal plasma and the emergent X-ray spectrum

Details The nonequilibrium ionization of solar flare coronal plasma and the emergent X-ray spectrum The nonequilibrium ionization of solar flare coronal plasma and the emergent X-ray spectrum

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..621s&link_type=abstract

Astrophysical Journal, Part 1, vol. 217, Oct. 15, 1977, p. 621-643.

Astronomy and Astrophysics

Astrophysics

33

Nonequilibrium Ionization, Plasma Temperature, Solar Corona, Solar Flares, Solar X-Rays, Ion Recombination, Radiant Flux Density, Temperature Effects, X Ray Spectra

Scientific paper

Consequences of a lack of equilibrium between the ionization and recombination of ions in the coronal plasma responsible for the thermal X-ray emission spectrum of solar flares are considered. A model of an impulsively heated nonequilibrium flare plasma is investigated in which a preflare coronal loop is 'instantaneously' heated, with rapid thermalization of the loop electrons occurring at a temperature of the order of 100 million K. It is shown that since the plasma is out of ionization equilibrium during the first few seconds before the onset of some energy-releasing instability, the emergent X-ray spectrum is a superposition of the thermal bremsstrahlung spectrum of hot electrons and the X-ray line and enhanced two-photon continuous spectra of the nonequilibrium ionization structure. Soft X-ray emission from this plasma is therefore burstlike, jumping to a significantly higher level when the electron temperature jumps and decaying dramatically as the gas becomes more ionized. The plasma model is used in a detailed calculation of the ionization structure of and the X-ray emission from the coronal flare plasma during the impulsive phase of solar flares.

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