Flare X-ray spectra observed by Diogenes scanning bragg spectrometer

Physics

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Flares, Solar Physics, Bragg Spectra, X-Ray Spectroscopy

Scientific paper

Diogeness is the uncollimated scanning flat crystal spectrometer observing flare X-ray spectra in four narrow wavelength bands in vicinity of Ca XIX, S XV and Si XIII He-like line "triplets" around 3.18 Å, 5.04 Å and 6.65 Å. In two spectral channels, the same emission lines around Ca XIX 3.178 Å resonance are scanned in opposite directions, being diffracted from precisely adjusted identical Quartz crystals mounted on the common shaft in so-called Dopplerometer configuration. During early phase of the CORONAS-F Mission, a number of big flares have been observed by Diogeness. In particular, tens of high resolution spectra have been measured during initial, maximum and decay phase of 25 August 2001 X5.3 flare. We present examples of these spectra, make prompt line identification, announcing observations of spectral features corresponding to transitions in Si XIV (Lyβ) He-like ion. Early interpretation of the spectra measured indicates for substantial variations of average plasma temperature during the observed flare. Our measurements will be further analysed in detail together with the spectra obtained aboard Yohkoh using Bent Crystal Spectrometer observations.

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