Computer Science – Numerical Analysis
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976azh....53..361k&link_type=abstract
Astronomicheskii Zhurnal, vol. 53, Mar.-Apr. 1976, p. 361-369. In Russian.
Computer Science
Numerical Analysis
2
Dynamic Models, Gas Dynamics, H Lines, Solar Flares, Density Distribution, H Alpha Line, Lyman Alpha Radiation, Lyman Beta Radiation, Lyman Spectra, Numerical Analysis, Shock Fronts, Spectral Line Width, Temperature Distribution, Velocity Distribution
Scientific paper
Emission in the Ly-alpha, Ly-beta, and H-alpha lines is analyzed on the basis of simultaneous numerical solutions to the equations of statistical equilibrium and radiative transfer in the investigated lines as well as the Lyman continuum for a three-level hydrogen atom. The equations are solved parametrically for a specified depth distribution of density, temperature, ionization, and gas velocity in a flare region heated by an accelerated electron flux. The distribution is obtained by solving the gasdynamic equations; the values of parameters characterizing physical conditions in the H-alpha excitation region correspond with observations. The theoretical H-alpha profiles are found to have the characteristic properties of observed profiles (self-reversal, asymmetry, line width). It is shown that the asymmetry is associated with the sign of the velocity gradient in the region where the central line intensity is produced and that Ly-alpha and Ly-beta emission is substantial in the surface layers of a flare. The results also indicate that the H-alpha emission is concentrated in a narrow layer behind a shock front and is distributed over a larger area after passage of the shock wave.
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