Ar XIII line ratios in solar flares |
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| Authors: | F P Keenan E S Conlon V J Foster K M Aggarwal K G Widing |
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| Institution: | (1) Department of Pure and Applied Physics, The Queen's University of Belfast, BT7 1NN Belfast, N. Ireland;(2) Department of Physics and Astrophysics, The University of Delhi, 110 007 Delhi, India;(3) E.O. Hulburt Center for Space Research, Naval Research Laboratory, 20375-5000 Washington, DC, USA |
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| Abstract: | Theoretical ArXIII electron-density-sensitive emission line ratios, derived using electron impact excitation rates interpolated from accurateR-matrix calculations, are presented forR
1 =I(242.22  )/I(236.27 ),R
2 =I(210.46 )/I(236.27 ), andR
3 =I(248.68 )/I(236.27 ). Electron densities deduced from the observed values ofR
1,R
2, andR
3 for solar flares obtained with the NRL S082A slitless spectrograph on boardSkylab are in excellent agreement, and furthermore compare favorably with those determined from line ratios in CaXV, which is formed at a similar electron temperature to that of ArXIII. These results provide experimental support for the accuracy of the atomic data adopted in the analysis, as well as for the techniques used to calculate the line ratios. |
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