An Extended Correlation Between the Balmer and Soft X-Ray Emission from Solar and Stellar Flares

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Stars: Flare Sun: Flares Balmer Emission, X-Ray Emission

Scientific paper

The integrated soft X-ray (8-12 Å) fluxes for solar flares, given by Thomas & Teske (1971), have been scaled to the equivalent EXOSAT (0.04-2.0 keV) fluxes using spectra obtained from a variety of rocket-based experiments and a model by Mewe for a 1.5 keV plasma. The data show good agreement with the soft X-ray-Hγ correlation established earlier for flares on dMe stars. Simultaneous GINGA and optical spectroscopy of a flare on the RS CVn star II Peg extends the correlation a further two orders of magnitude and confirms that a common, linear, relationship applies to all stellar and solar flares for which data is currently available. The significance of the result for various flare models is discussed.

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