Hostname: page-component-76fb5796d-zzh7m Total loading time: 0 Render date: 2024-04-27T03:20:03.871Z Has data issue: false hasContentIssue false
  • English
  • Français

Collisional excitation of autoionizing levels

Published online by Cambridge University Press:  14 August 2015

Leo Goldberg ,
Andrea K. Dupree  and
John W. Allen
Leo Goldberg
Affiliation:
Harvard College Observatory, Cambridge, Massachusetts, U.S.A. Smithsonian Astrophysical Observatory, Cambridge, Massachusetts, U.S.A.
Andrea K. Dupree
Affiliation:
Harvard College Observatory, Cambridge, Massachusetts, U.S.A.
John W. Allen
Affiliation:
Harvard College Observatory, Cambridge, Massachusetts, U.S.A.

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Collisional excitation of autoionizing levels is found to contribute significantly to the ionization rate for certain ions at temperatures characteristic of the solar corona. Preliminary calculations have been carried out for O IV, O V, O VI, Fe XV and Fe XVI. Autoionization may be of importance for O IV and increases by approximately a factor of two the ionization rate of Fe XV and XVI.

On montre que l'excitation par chocs des niveaux d'autoexcitation est un facteur important dans la détermination du taux d'ionisation de certains ions aux tempéraiures coronales. On à mené des calculs préliminaires pour О IV, O V, O VI, Fe XV et Fe XVI. L'autoionisation semble importante pour О IV et augmente d'un facteur 2 le taux d'ionisation de Fe XV et Fe XVI.

Резюме

Резюме

Показано, что возбуждение ударами уровней самовозбуждения является важным фактором в определении степени ионизации некоторых ионов при корональных температурах. Ъыли проведены предварительные вычисления для О IV, О V, О VI, Fe XV и Fe XVI. Самоионизация по-видимому значительна для О IV и умножает на 2 степень ионизации Fe XV и Fe XVI.

Type
Session III. Interpretation of the Solar X. U. V. Observations
Information
Symposium - International Astronomical Union , Volume 23: Astronomical Observations from Space Vehicles , 1965 , pp. 125 - 129
Copyright
Copyright © CNRS 1965 

References

Allen, C. W., 1960, M. N., 121, 299.Google Scholar
Allen, J. W., 1964, private communication.Google Scholar
Burgess, A. and Seaton, M. J., 1964, M. N., 127, 335.Google Scholar
Condon, E. M. and Shortley, G. H., 1963, The Theory of Atomic Spectra (Cambridge, England: University Press).Google Scholar
Ditchburn, R. W. and Öpik, U., 1962, in Atomic and Molecular Processes, ed. Bates, D. R. (New York: Academic Press), chap. 3.Google Scholar
Froese, C., 1964, Ap. J., 140, 361.Google Scholar
Moore, C. E., 1949, Atomic Energy Levels, N. B. S. Circular No. 467.Google Scholar
Seaton, M. J., 1964, Plan. and Sp. Sci., 12, 55.CrossRefGoogle Scholar
Shore, B. W. and Menzel, D. H., 1965, Ap. J. Supply., 106.Google Scholar
Van Regemorter, H., 1962, Ap. J., 136, 906.Google Scholar