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Stellar flare diagnostics from multi–wavelength observations

2009; Cambridge University Press; Volume: 5; Issue: S264 Linguagem: Inglês

10.1017/s174392130999281x

1743-9221

A. V. Stepanov, Yuri T. Tsap, Yu. G. Kopylova,

Ionosphere and magnetosphere dynamics

Abstract Quasi–periodic pulsations in various wavebands are natural manifestations of emission of stellar flares. We suggest a diagnostic tool of stellar flares based on the coronal seismology and the solar–stellar analogy. Two approaches are used: (I) flare loop as a resonator for MHD oscillations and (II) flare loop as an equivalent electric circuit. Using optical, X–ray, and radio data we obtained flare plasma parameters for the red dwarfs EQ Peg, AT Mic, and AD Leo. The characteristic length of stellar flare loops l ~ R * and their electric currents turned out to be one–two orders of magnitude lager than the solar ones. Advantages of proposed diagnostics in comparison to the scaling law methods are given.