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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

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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 

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