Numerical simulations of loops heated to solar flare temperatures. I

Details Numerical simulations of loops heated to solar flare temperatures. I Numerical simulations of loops heated to solar flare temperatures. I

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265.1090c&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 15, 1983, p. 1090-1119. NASA-Navy-supported research.

Astronomy and Astrophysics

Astrophysics

85

Coronal Loops, Solar Flares, Solar Temperature, Solar X-Rays, Ultraviolet Spectra, Chromosphere, Light Curve, Magnetic Field Configurations, Magnetic Flux, Magnetohydrodynamic Stability, Plasma Compression, Plasma Diagnostics, Plasma Heating, Solar Magnetic Field, Solar Radiation, Solar Spectra, Spectral Energy Distribution, Spectral Line Width

Scientific paper

The NRL's Dynamic Flux Tube Model is used to numerically simulate the dynamic response of a coronal magnetic loop to an energy input of the order encountered in solar flares. The coronal plasma is heated by the deposition of flare energy at the top of the loop to more than 10 million K, yielding a conduction front that moves toward the chromosphere, where the plasma is heated by the large downward conductive flux and ablates upward to the coronal part of the loop at velocities of a few hundred km/sec. The conduction front simultaneously produces chromospheric ablation and compresses the material ahead of it. With the aid of compressional instabilities, the compressed plasma grows throughout the flare heating phase, presenting a possible source of the flare optical continuum emission which is correlated with soft X-ray radiation. The observational consequences of rapidly heated loop gas dynamic processes are discussed. In the second part of this presentation, the dynamical calculation results previously obtained are used to predict the spectral line intensities, profiles and wavelengths of several X-ray lines and the UV line of Fe XXI at 1354.1 A. Three different viewing orientations of the loop are considered.

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