Flare diagnostics based on Prognoz 9 X-ray data

Abstract The X-ray fluxes measured aboard the Prognoz 9 satellite in the energy range 2–160 keV have been analysed for several big flares which occurred during 1983. A new method of analysis called LEBAN (Loop Energy Balance Analysis) has been applied. The LEBAN method allows us to estimate the effective length and volume of the flaring loop under the assumption of single constant-cross-section geometry. Results of the analysis provide the necessary information to investigate in detail the time behaviour of individual terms comprising the energy balance equation for the hot (T > 4MK) flaring plasma. The LEBAN method is described and the flare parameters derived for eight flares are presented.