The excitation equilibrium of coronal ions

Solar Physics ◽  
1970 ◽  
Vol 11 (1) ◽  
pp. 68-81 ◽  
Author(s):  
J. B. Zirker
Keyword(s):  
Excitation Equilibrium

scholarly journals Accurate Spectroscopic Surface Gravities for 8 Sub-Giants

1988 ◽  
Vol 132 ◽  
pp. 387-388
Author(s):  
Bengt Edvardsson
Keyword(s):  
Error Analysis ◽  
Single Line ◽  
Strong Line ◽  
Photometric System ◽  
Atmospheric Parameters ◽  
Chemical Abundances ◽  
Effective Temperatures ◽  
Ionization Equilibria ◽  
Excitation Equilibrium

Logarithmic surface gravities between 2.9 and 3.8 (cgs) have been determined for eight G8IV-K2III stars from the analysis of pressure broadened wings of strong metal lines. Comparisons with trigonometrically determined surface gravities give support to the spectroscopic results. A thorough and rather conservative error analysis suggests that the errors are smaller than about 30% and confirms that the method is very insensitive to uncertainties in the fundamental stellar atmospheric parameters. Surface gravities of α Cen A and B and of Arcturus have also been obtained. Chemical abundances have been derived for 12 elements from Na to Ni, and for five heavier elements from Y to Nd have tentative abundances been derived from a single line of each element. Effective temperatures in the photometric system of Frisk (1983) are found to be consistent with spectroscopic temperatures from the excitation equilibrium of Fe I. Surface gravities determined from the ionization equilibria of Fe and Si are found to be systematically lower than the strong line gravities, which may be an effect of errors in the model atmospheres, or departures from LTE in the ionization equilibria.

The Excitation Equilibrium in the Solar Corona and Non-Maxwellian Electron Distributions

1994 ◽  
Vol 144 ◽  
pp. 435-438
Author(s):  
E. Dzifčáková
Keyword(s):  
Distribution Function ◽  
Solar Corona ◽  
Maxwellian Distribution ◽  
Collisional Excitation ◽  
Excitation Coefficient ◽  
Electron Distributions ◽  
Maxwellian Distribution Function ◽  
Excitation Equilibrium

AbstractWe demonstrate the influence of an electron non-Maxwellian distribution function on the collisional excitation coefficient and, as an example, on the excitation equilibrium of Fe XIV in the solar corona. The results can be used for specific applications in the solar corona, especially in the active corona, where deviations from Maxwellian distribution can be significant.

Measurement of Excitation Equilibrium Departure Evolution in an Argon Pulsed Plasma

1999 ◽  
Vol 68 (12) ◽  
pp. 3885-3892 ◽  
Author(s):  
Juan A. Aparicio ◽  
Juan A. del Val ◽  
Victor R. González ◽  
Marco A. Gigosos ◽  
Concepcion Pérez ◽  
...  
Keyword(s):  
Pulsed Plasma ◽  
Excitation Equilibrium

scholarly journals Ionization and Excitation Equilibrium of Call in the Solar Atmosphere.

1962 ◽  
Vol 67 ◽  
pp. 110
Author(s):  
R. Grant Athay ◽  
J. B. Zirker
Keyword(s):  
Solar Atmosphere ◽  
Excitation Equilibrium

F i Ionization and Excitation Equilibrium in the Solar Atmosphere

1972 ◽  
Vol 176 ◽  
pp. 809 ◽  
Author(s):  
R. Grant Athay ◽  
B. W. Lites
Keyword(s):  
Solar Atmosphere ◽  
Excitation Equilibrium
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