A correlation between Balmer and soft X-ray emission from stellar and solar flares

Details A correlation between Balmer and soft X-ray emission from stellar and solar flares A correlation between Balmer and soft X-ray emission from stellar and solar flares

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...206l...1b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 206, no. 1, Nov. 1988, p. L1-L4. Research supported by NATO, MPI and CNR.

Astronomy and Astrophysics

Astronomy

20

Astronomical Spectroscopy, Balmer Series, H Gamma Line, Solar Flares, Stellar Flares, X Ray Astronomy, Exosat Satellite, Solar X-Rays, Stellar Models, Stellar Physics

Scientific paper

Simultaneous optical spectroscopy and X-ray monitoring of stellar and solar flares shows that a well-defined linear correlation exists between the integrated Hγ and soft X-ray flux that extends over four orders of magnitude. The existence of this relationship implies a direct proportionality between the emission from the cooler and denser regions (T ≈ 104K) responsible for Balmer lines and the emission from the hot plasma (T ≈ 107K) responsible for soft X-rays. The consequences are considered for (a) several models which have been proposed for solar flares, and (b) the suggestion that the Balmer emission results from irradiation by soft X-rays.

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