Analysis of the High Resolution X-Ray Spectra Obtained Aboard the INTERCOSMOS-16 Satellite - Part One - Identification of the Lines in the 9.14-9.33A Spectral Region
Abstract
The Bragg-type, flat ADP crystal spectrometer, launched on board the INTERCOSMOS 16 satellite has been used for measurements of the X-ray spectra emitted from solar active region plasmas. During the period of the instrument operation (August-September, 1976) only a few active regions were present on the Sun (minimum of the solar activity). About 60 spectra have been registered. In the present paper using a spectrum averaged over 20 scans, we measured the wavelengths corresponding to the statistically significant spectral features seen in this spectrum in the wavelength range 9.14-9.33 Å. By comparison with the calculated line wavelengths and intensities predicted in the framework of the thermal model of the `average' active region, we performed the identification of these features. Besides rather prominent resonance, intercombination, and forbidden lines of the He-like ion Mg XI, it was possible to identify the satellite lines which correspond to 1s2nl - 1s2p nl transitions from the states with n = 2, 3, and 4. The present paper is the first in a series dealing with the INTERCOSMOS 16 Mg XI spectra.
- Publication:
-
Solar Physics
- Pub Date:
- September 1981
- DOI:
- 10.1007/BF00153148
- Bibcode:
- 1981SoPh...73..105K
- Keywords:
-
- Intercosmos Satellites;
- Plasma Diagnostics;
- Resonance Lines;
- Satellite-Borne Instruments;
- Solar Corona;
- X Ray Spectroscopy;
- Calibrating;
- High Resolution;
- Line Spectra;
- Solar Flares;
- Solar Instruments;
- Solar Physics;
- Active Region;
- Wavelength Range;
- Spectral Feature;
- Solar Activity;
- Thermal Model