Mg vii and Si ix line ratios in the sun |
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| Authors: | F P Keenan A E Kingston K M Aggarwal K G Widing |
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| Institution: | (1) The Department of Applied Mathematics and Theoretical Physics, The Queen's University of Belfast, BT7 1NN Belfast, N. Ireland;(2) E. O. Hulburt Center for Space Research, Naval Research Laboratory, 20375 Washington, DC, U.S.A. |
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| Abstract: | Recent R-matrix calculations of electron excitation rates for Mg vii and Si ix are used to determine the theoretical density sensitive emission line ratios R
1= I(2s2p
3
1
D
0 - 2s
2
2p
2
1
D
e
)/I(2s2p
3
3
S
0 - 2s
2
2p
2
3
P
2
e
) and R
2= I(2s2p
3
1
P
0 - 2s
2
2p
2
1
D
e
)/I(2s2p
3
3
S
0 - 2s
2
2p
2
3
P
2
e
). These are found to be quite similar to the earlier results of Mason and Bhatia. Electron densities derived using observed R
1 and R
2
ratios from Skylab NRL XUV spectra of solar flares and active regions are in good agreement, and compare favourably with those deduced from ions formed at similar electron temperatures to Mg vii and Si ix. |
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| Keywords: | |
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