Quasi-periodic pulsations as a diagnostic tool for coronal plasma parameters

Abstract

Quasi-periodic pulsations of radio emission generated in solar and stellar flares are interpreted in terms of MHD oscillations of coronal loops and in the frame of equivalent electric circuit approach, and compared with coronal wave and oscillatory phenomena recently discovered in the EUV, X-ray and visible light bands. Various methods of remote diagnostics of the coronal plasma, based upon the use of observationally detectable properties of quasi-periodic pulsations - their period, amplitude and quality - are discussed. The applicability of these methods to the diagnostics of stellar coronae is demonstrated. © 2007 Springer.