The L-alpha/H-alpha ratio in solar flares, quasars, and the chromosphere

Details The L-alpha/H-alpha ratio in solar flares, quasars, and the chromosphere The L-alpha/H-alpha ratio in solar flares, quasars, and the chromosphere

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222l.105z&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 222, June 15, 1978, p. L105-L107.

Astronomy and Astrophysics

Astrophysics

25

Chromosphere, H Alpha Line, Lyman Alpha Radiation, Quasars, Solar Flares, Astronomical Spectroscopy, Solar Prominences, Solar Spectra

Scientific paper

The ratio of L-alpha to H-alpha is around unity in flares, quasars, and the solar chromosphere and prominences. The weakness of L-alpha is shown to be essentially due to photon trapping and deexcitation, but it is argued that the surprising stability of this ratio is due to the role of these lines in cooling the plasma rather than the accidental parameters used in various models of these widely different phenomena.

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