Abstract
R-matrix calculations of the 11S - 23S and 11S - 23P electron excitation rates in He - like Cv, Ovii, and Mgxi by Kingston and Tayal are used to interpolate results for Neix. Adoption of these in emission line strength calculations leads to values for the density-sensitiveR ratio very similar to those of Pradhanet al. and Wolfsonet al., although the temperature-sensitiveG ratios are approximately 10 to 20 % lower than those deduced by these authors. However the present theoretical value ofG at the temperature of maximum Neix emission,G(T m) = 0.82, is in excellent agreement with those observed by the SMM and P78-1 satellites for the 1980, November5 flare (G = 0.83 ± 0.01) and nonflaring active regions (G = 0.80 ± 0.05), respectively.
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References
Accad, Y., Perkeris, C. L., and Schiff, B.: 1971,Phys. Rev. A4, 516.
Acton, L. W.: 1978,Astrophys. J. 225, 1069.
Acton, L. W. and Brown, W. A.: 1978,Astrophys. J. 225, 1065.
Bashkin, S. and Stoner, J. O.: 1975,Atomic Energy Levels and Grotrian Diagrams, North-Holland Publ. Co., Amsterdam.
Berrington, K. A., Burke, P. G., Le Dourneuf, M., Robb, W. D., Taylor, K. T., and Lan, V. K.: 1978,Comp. Phys. Commun. 14, 367.
Blumenthal, G. T., Drake, G. W. F., and Tucker, W. H.: 1972,Astrophys. J. 172, 205.
Cohen, M. and McEachran, R. P.: 1972,Can. J. Phys. 50, 1363.
Doyle, J. G., Tayal, S. S., and Kingston, A. E.: 1983,Monthly Notices Roy. Astron. Soc. 203, 31P.
Drake, G. W. F., Victor, G. A., and Dalgarno, A.: 1969,Phys. Rev. 180, 25.
Dufton, P. L.: 1977,Comp. Phys. Commun. 13, 25.
Dufton, P. L., Berrington, K. A., Burke, P. G., and Kingston, A. E.: 1978,Astron. Astrophys. 62, 111.
Gabriel, A. H. and Heddle, D. W. O.: 1960,Proc. Roy. Soc. London A258, 124.
Gabriel, A. H. and Jordan, C.: 1969,Monthly Notices Roy. Astron. Soc. 145, 241.
Godefroid, M. and Verhaegen, G.: 1980,J. Phys. B13, 3081.
Jacobs, V. L.: 1972,J. Phys. B5, 213.
Jordan, C.: 1969,Monthly Notices Roy. Astron. Soc. 142, 501.
Jordan, C. and Veck, N. J.: 1982,Solar Phys. 78, 125.
Keenan, F. P., Tayal, S. S., and Kingston, A. E.: 1984a,Monthly Notices Roy. Astron. Soc. 207, 51P.
Keenan, F. P., Berrington, K. A., Burke, P. G., Dufton, P. L., and Kingston, A. E.: 1984b,Monthly Notices Roy. Astron. Soc. 207, 459.
Kingston, A. E. and Tayal, S. S.: 1983a,J. Phys. B16, L53.
Kingston, A. E. and Tayal, S. S.: 1983b,J. Phys. B16, 3465.
Laughlin, C: 1978,J. Phys. B11, L391.
Lin, C. D., Johnston, W. R., and Dalgarno, A.: 1977,Phys. Rev. A15, 154.
McKenzie, D. L. and Landecker, P. B.: 1982,Astrophys. J. 259, 372.
Mewe, R. and Gronenschild, E. H. B. M.: 1981,Astron. Astrophys. Suppl. 45, 11.
Mewe, R. and Schrijver, J.: 1978,Astron. Astrophys. 65, 99.
Pradhan, A. K.: 1982,Astrophys. J. 263, 477.
Pradhan, A. K. and Shull, J. M.: 1981,Astrophys. J. 249, 821.
Pradhan, A. K., Norcross, D. W., and Hummer, D. G.: 1981,Astrophys. J. 246, 1031.
Sampson, D. H., Parks, A. D., and Clark, R. E. H.: 1978,Phys. Rev. A17, 1619.
Schiff, B., Perkeris, C. L., and Accad, Y.: 1971,Phys. Rev. A54, 885.
Tayal, S. S. and Kingston, A. E.: 1984,J. Phys. B17, L145.
Wolfson, C. J., Doyle, J. G., Leibacher, J. W., and Phillips, K. J. H.: 1983,Astrophys. J. 269, 319.
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Keenan, F.P., Tayal, S.S. & Kingston, A.E. Theoretical Neix line ratios compared to solar observations. Sol Phys 94, 85–89 (1984). https://doi.org/10.1007/BF00154809
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DOI: https://doi.org/10.1007/BF00154809