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

Published online by Cambridge University Press:  27 September 2017

C.J. Butler ,
M. Rodono  and
B.H. Foing
C.J. Butler
Affiliation:
Armagh Observatory, College Hill, Armagh, BT61 9DG, N. Ireland
M. Rodono
Affiliation:
Instituto di Astronomia, Universita di Catania and Osservatorio Astrofisico, I-95125, Catania, Italy
B.H. Foing
Affiliation:
Centre National de la Recherche Scicntifique, Institut d'Astrophysique Spatiale, B.P. 10, 91371 Verriers le Buisson, France

Summary

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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.

Type
Session I: Stellar Flares
Information
International Astronomical Union Colloquium , Volume 104 , Issue 2: Solar and Stellar Flares , 1989 , pp. 21 - 25
Copyright
Copyright © Kluwer 1989

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