Abstract
Improved level values for 3s 2 3p 5 3d and 3s 2 3p 4 3d of Fe ix and Fe x are derived from the observed forbidden lines with special regard to recent accurate measurements in the vacuum-ultraviolet part of the coronal spectrum. A procedure for estimating expected relative intensities is proposed and used for an additional check on the consistency of the identifications, which now comprise 12 lines of Fe IX and 11 lines of Fe x. Finally, by use of a suitable extrapolation technique the wavelengths of corresponding lines in nickel are predicted, which leads to some new identifications and a total of 6 identified lines of Ni xi and 4 of Ni xii.
Similar content being viewed by others
References
Behring, W. E., Cohen, L., and Feldman, U.: 1972, Astrophys. J. 175, 493.
Behring, W. E., Cohen, L., Feldman, U., and Doschek, G. A.: 1976, Astrophys. J. 203, 521.
Bromage, G. E., Cowan, R. D., and Fawcett, B. C.: 1977, Physica Scripta 15, 177.
Ekberg, J. O.: 1976a, Physica Scripta 13, 111.
Ekberg, J. O.: 1976b, Physica Scripta 13, 215.
Feldman, U. and Doschek, G. A.: 1977, J. Opt. Soc. Am. 67, 726.
Flower, D. R.: 1977, Astron. Astrophys. 56, 451.
Jefferies, J. T.: 1969, Mém. Soc. Roy. Sci. Liège (5) 16, 213.
Jefferies, J. T., Orrall, F. Q., and Zirker, J. B.: 1971, Solar Phys. 16, 103.
Magnant-Crifo, F.: 1973, Solar Phys. 31, 91.
Magnant-Crifo, F.: 1975, Solar Phys. 41, 109.
Mason, H. E. and Nussbaumer, H.: 1977, Astron. Astrophys. 54, 547.
Sandlin, G. D.: 1977, private letter.
Sandlin, G. D., Brueckner, G. E., and Tousey, R.: 1977, Astrophys. J. 214, 898.
Smitt, R.: 1973, Physica Scripta 8, 292.
Smitt, R.: 1977, Solar Phys. 51, 113.
Smitt, R., Svensson, L. Å., and Outred, M.: 1976, Physica Scripta 13, 293.
Svensson, L. Å.: 1976, Physica Scripta 13, 235.
Svensson, L. Å., Ekberg, J. O., and Edlén, B.: 1974, Solar Phys. 34, 173.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Edlén, B., Smitt, R. The forbidden transitions within 3s 2 3p 5 3d of Fe ix and Ni xi and 3s 2 3p 4 3d of Fe x and Ni xii . Sol Phys 57, 329–339 (1978). https://doi.org/10.1007/BF00160106
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00160106