Mgix emission lines in an active region spectrum obtained with the Solar EUV Rocket Telescope and Spectrograph (SERTS) |
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| Authors: | F P Keenan E S Conlon R J Thomas W M Neupert |
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| Institution: | (1) Department of Pure and Applied Physics, The Queen's University of Belfast, BT7 INN Belfast, N. Ireland;(2) Laboratory for Astronomy and Solar Physics, Code 680, NASA/Goddard Space Flight Center, 20771 Greenbelt, MD, USA |
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| Abstract: | Theoretical electron-temperature-sensitive Mgix emission line ratios are presented forR
I =I(443.96  )/I(368.06 ),R
2 =I(439.17 )/I(368.06 ),R
3 =I(443.37 )/I(368.06 ),R
4 =I(441.22 )/I(368.06 ), andR
5 =I(448.28 )/I(368.06 ). 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 forR
1 throughR
4, 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 ofR
5, the theoretical and observed ratios differ by almost a factor of 2. This may be due to the measured intensity of the 448.28 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 ). |
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