Mgix Emission Lines in an Active Region Spectrum Obtained with the Solar Extreme Ultraviolet Rocket Telescope and Spectrograph / SERTS
Abstract
Theoretical electron-temperature-sensitive MgIX emission line ratios are presented forRI =I(443.96 å)/I(368.06 å),R2 =I(439.17 å)/I(368.06 å),R3 =I(443.37 å)/I(368.06 å),R4 =I(441.22 å)/I(368.06 å), andR5 =I(448.28 å)/I(368.06 å). A comparison of these with observational data for a solar active region, obtained during a rocket flight by the Solar EUV Rocket Telescope and Spectrograph (SERTS), reveals excellent agreement between theory and observation forR1 throughR4, with discrepancies that average only 9%. This provides experimental support for the accuracy of the atomic data adopted in the line ratio calculations, and also resolves discrepancies found previously when the theoretical results were compared with solar data from the S082A instrument on boardSkylab. However in the case ofR5, the theoretical and observed ratios differ by almost a factor of 2. This may be due to the measured intensity of the 448.28 å line being seriously affected by instrumental effects, as it lies very close to the long wavelength edge of the SERTS spectral coverage (235.46−448.76 å).
- Publication:
-
Solar Physics
- Pub Date:
- February 1994
- DOI:
- 10.1007/BF00690618
- Bibcode:
- 1994SoPh..149..301K
- Keywords:
-
- Emission Spectra;
- Extreme Ultraviolet Radiation;
- Line Spectra;
- Magnesium;
- Solar Activity;
- Solar Spectra;
- Ultraviolet Astronomy;
- Ultraviolet Spectra;
- Astronomical Spectroscopy;
- Electron Density (Concentration);
- Electron Energy;
- Electron Impact;
- Electron Transitions;
- Mathematical Models;
- Rocket-Borne Instruments;
- Skylab Program;
- Soho Mission;
- Spectrographs;
- Ultraviolet Telescopes;
- Astronomy;
- Active Region;
- Theoretical Result;
- Observational Data;
- Excellent Agreement;
- Measured Intensity