Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10695002 | Advances in Space Research | 2005 | 5 Pages |
Abstract
Observations and their analysis of the thermal X-ray spectrum of the M2 flare on 2003 April 26 are described. The spectrum observed by the RHESSI mission cover the energy range from â¼5 to â¼50Â keV. With its â¼1-keV spectral resolution, intensities and equivalent widths of two line complexes, the Fe line group at 6.7 keV (mostly due to Fe xxv lines and Fe xxiv satellites) and the Fe/Ni line group at 8Â keV (mostly due to higher-excitation Fe xxv lines and Ni xxvii lines) were obtained as a function of time through a number of flares. The abundance of Fe can also be determined from RHESSI spectra; it appears to be consistent with a coronal value for at least some times during the flare. Comparisons of RHESSI spectra with those from the RESIK crystal spectrometer on CORONAS-F show very satisfactory agreement, giving much confidence in the intensity calibration of both instruments.
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Authors
B.R. Dennis, K.J.H. Phillips, J. Sylwester, B. Sylwester, R.A. Schwartz, A.K. Tolbert,