Physics
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...41..415d&link_type=abstract
Solar Physics, vol. 41, Apr. 1975, p. 415-424. Research supported by the Stifterverband für die Deutsche Wissenschaft.
Physics
4
Lyman Spectra, Solar Flares, Spectral Line Width, Doppler Effect, Electron Density (Concentration), Hydrogen Atoms, Solar Temperature, Stark Effect
Scientific paper
The Lyman spectrum of hydrogen has been computed for a number of flare models, characterized by the column density of hydrogen atoms in the ground state (N-1), the electron density, and the electron temperature. Broadening by the thermal Doppler effect and by the Stark effect has been accounted for. The source functions for the individual lines of the series have been derived from non-LTE calculations of the excitation in hydrogen flares. The aim of the investigation is to evaluate the use of the intensities between two successive Lyman lines for a determination of the value of N-1, which is a physical parameter of the flare for which only indirect determinations are available. While in principle this method could give reliable results, its practical application meets with difficulties which are hard to overcome. Therefore, one probably has to base the N-1 determination on the highest resolvable line in the spectrum.
de Feiter L. D.
Svestka Zdenek
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