Erratum: Transfer of Line Radiation in Differentially Expanding Atmospheres.IV. The Two-Level Atom in Plane-Parallel Geometry Solved by the Feautrier Method .

1976 ◽  
Vol 203 ◽  
pp. 769
Author(s):  
P. D. Noerdlinger ◽  
G. B. Rybieki
Keyword(s):  
Line Radiation ◽  
Plane Parallel ◽  
Level Atom ◽  
Parallel Geometry

scholarly journals EUVE Spectra of Coronae and Flares

1996 ◽  
Vol 152 ◽  
pp. 81-88 ◽  
Author(s):  
Carole Jordan
Keyword(s):  
Short Wavelength ◽  
Extreme Ultraviolet ◽  
Emission Measure ◽  
Wavelength Region ◽  
Late Type ◽  
Short Wavelength Region ◽  
Plane Parallel ◽  
Parallel Geometry ◽  
Measure Distribution

Following a summary of early solar EUV spectroscopy the spectra of some late-type stars obtained with the Extreme Ultraviolet Explorer (EUVE) are briefly surveyed. Some transitions which are not included in current emissivity codes but could lead to numerous weak lines, and an apparent continuum in the EUVE short wavelength region, are discussed. The importance of the geometry adopted when interpreting the emission measure distribution is stressed, since radial factors can lead to an apparent emission measure distribution gradient that is steeper than the value of 3/2 expected in plane parallel geometry.

scholarly journals Asymmetry of Emerging Flux Loops Caused by Radial Differential Rotation

1990 ◽  
Vol 138 ◽  
pp. 321-324
Author(s):  
M. Marik ◽  
K. Petrovay
Keyword(s):  
Magnetic Flux ◽  
Differential Rotation ◽  
Numerical Models ◽  
Convective Zone ◽  
Flux Tubes ◽  
Plane Parallel ◽  
The Future ◽  
Flux Loops ◽  
Parallel Geometry ◽  
The Asymmetry

Observational and theoretical arguments in favor of a supposed serious asymmetry of magnetic flux loops emerging through the convective zone are briefly summarized. Results from numerical models of flux tubes moving through a differentially rotating upper convective zone are presented (plane parallel geometry, SFT approximation). In most models, especially in the most realistic ones, a remarkable asymmetry of the flux loop is found. It is concluded that in the future observational effects caused by the asymmetry may be used to put quantitative constraints on subphotospheric rotation.

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