Other
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389l..33y&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 389, April 10, 1992, p. L33-L35.
Other
11
Emission Spectra, Helium, Line Shape, Line Spectra, Solar Flares, Solar Limb, Electron Density (Concentration), H Beta Line, Mass Transfer
Scientific paper
An observation of an unusually broad He I 10830 A line from a flare on the solar limb is discussed. The line profile is close to a dispersion profile with full half-width of 4.2 A. One interpretation of this observation could be a peculiar distribution of mass motions in the flare that is just right to mimic a dispersionlike line profile. Pressure broadening is usually indicated by a dispersion profile but is also an unlikely cause of the broadening because it would imply an electron density in the flare near 4 x 10 exp 17 cu cm. No other credible explanations are found for the observed broadening. A critical experiment is proposed to distinguish clearly between the two interpretations or to point the way toward another.
Oertel Goetz K.
You Jian-Qi
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