The thermal X-ray spectrum of the 2003 April 26 solar flare |
| |
| Institution: | 1. Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Code 612, Greenbelt, MD 20771, USA;2. National Research Council, NASA Goddard Space Flight Center, Code 612 (Bldg. 21 RHESSI) Greenbelt, MD 20771, USA;3. Space Research Centre, Polish Academy of Sciences, ul. Kopernika 11, PL-51-622 Wroclaw, Poland;4. SSAI, NASA Goddard Space Flight Center, Code 612, Greenbelt, MD 20771, USA |
| |
| 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 ～5 to ～50 keV. With its ～1-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 8 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. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
