| Abstract: |
|
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 
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. |
