Ca X line ratios in solar flares |
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| Authors: | F. P. Keenan V. J. Foster I. J. Roche M. Mohan K. G. Widing |
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| Affiliation: | (1) Department of Pure and Applied Physics, The Queen's University of Belfast, BT7 INN Belfast, Northern Ireland;(2) Department of Physics, Kirori Mal College, Delhi University, 110007 Delhi, India;(3) Code 4174W, E.O. Hulburt Center for Space Research, Naval Research Laboratory, 20375-5000 Washington DC, USA |
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| Abstract: | Theoretical Ca X electron temperature sensitive emission line ratios, derived using electron excitation rates interpolated from accurateR-matrix calculations, are presented forR1 =I(419.74  )/I(574.02 ,),R2 =I(411.65 )/I(574.02 ),R3 =I(419.74 )/I(557.75 ), andR4 =I(411.65 )/I(557.75 ). A comparison of these with observational data for three solar flares, obtained by the Naval Research Laboratory's S082A slitless spectrograph on boardSkylab, reveals good agreement between theory and observation forR1 andR3 in one event, which provides limited support for the accuracy of the atomic data adopted in the analysis. However, in the other flares the observed values ofR1 –R4 are much larger than the theoretical high-temperature limits, which is probably due to blending of the 419.74 line with Civ 419.71 , and 411.65 with possibly Ciii 411.70 . |
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