Physics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979azh....56.1272o&link_type=abstract
Astronomicheskii Zhurnal, vol. 56, Nov.-Dec. 1979, p. 1272-1280. In Russian.
Physics
Chromosphere, Solar Flares, Solar Limb, Solar Physics, Balmer Series, Electron Density (Concentration), Optical Thickness, Photoionization, Solar Spectra, Solar Temperature, Ultraviolet Spectra
Scientific paper
The physical conditions within the first magnitude limb flare of July 25, 1959 are investigated based on observations of chromospheric Balmer lines at various chromospheric altitudes. The optical thickness, reduced Doppler width and self-absorption factor are calculated from the entire line shapes of the H4-H15 lines by the method of curve widths, along with the densities at each level, and the physical conditions are determined from the solution of a system of steady-state equations assuming the observed emissions are a result of excitation by purely thermal mechanisms. Values of 11000 K for the electron temperature, 6.3 x 10 to the 12th/cu cm for the electron density, 1.7 x 10 to the 7th for the effective length of the flare region along the line of sight, 57 for the H alpha line optical depth, 0.00013 for the reduced Doppler width and 18 for the ratio of electron density to the density in the first electron level are obtained.
Ostapenko V. A.
Polupan P. N.
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