The excitation of helium resonance lines in solar flares

Details The excitation of helium resonance lines in solar flares The excitation of helium resonance lines in solar flares

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985smm..conf.....p&link_type=abstract

National Solar Observatory, Solar Maximum Mission Summer Meeting, Sunspot, NM, Aug. 20-24, 1985, Paper. 17 p.

Astronomy and Astrophysics

Astronomy

Astronomical Spectroscopy, Helium, Resonance Lines, Solar Flares, Atmospheric Models, Atomic Energy Levels, Solar X-Rays, Spectroheliographs, Stellar Models

Scientific paper

Helium resonance line intensities are calculated for a set of six flare models corresponding to two rates of heating and three widely varying incident fluxes of soft X-rays. The differing ionization and excitation equilibria produced by these models, the processes which dominate the various cases, and the predicted helium line spectra are examined. The line intensities and their ratios are compared with values derived from Skylab NRL spectroheliograms for a class M flare, thus determining which of these models most nearly represents the density vs temperature structure and soft X-ray flux in the flaring solar transition region, and the temperature and dominant mechanaism of formation of the helium line spectrum during a flare.

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