Mgix and Sixi line ratios in the sun |
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| Authors: | F P Keenan A E Kingston P L Dufton J G Doyle K G Widing |
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| Institution: | (1) Department of Applied Mathematics and Theoretical Physics, Queens University, B17 1NN Belfast, N. Ireland;(2) Department of Pure and Applied Physics, Queens University, B17 1NN Belfast, N. Ireland;(3) Armagh Observatory, BT61, 9DG College Hill, Armagh, N. Ireland;(4) E. O. Hulburt Center for Space Research, Naval Research Laboratory, 20375 Washington DC, USA |
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| Abstract: | New theoretical emission line ratios for the Be-sequence ions Mgix and Sixi are presented. A comparison with observational data for two solar flares and an active region loop obtained with the Harvard EUV spectrometer and NRL XUV spectroheliograph aboard Skylab reveals that these plasmas are in ionization equilibrium at coronal temperatures. Unfortunately most of the density diagnostics are not particularly useful under solar plasma conditions, as they vary only slightly over the electron density range 108–1013cm–3. However the Sixi ratioI(3
P
e
2 -3
P
o
2)/I(3
P
o
1 –1
S
e
0) is density sensitive in the range 108 to 1010cm–3, which is representative of electron densities found in solar active regions or small flares. |
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