The relative intensities of nitrogen lines in the semi-coronal regime

1973 ◽  
Vol 9 (1) ◽  
pp. 77-88 ◽  
Author(s):  
W. A. Cilliers ◽  
J. D. Hey ◽  
J. P. S. Rash
Keyword(s):  
Spectral Line ◽  
Electron Temperature ◽  
Electron Density ◽  
Line Intensity ◽  
Intensity Ratio ◽  
Spectral Lines ◽  
Spectral Line Intensity ◽  
Line Intensity Ratio ◽  
Ratio Data ◽  
Intensity Ratios

At plasma densities lower than about 1018 cm-3, strictly speaking, the LTE model cannot be used when the electron temperature is calculated from measured spectral line intensity ratios. In this work a number of nitrogen spectral lines were studied at an electron density of about 1016 cm-3, and the results are discussed with reference to the LTE and semi-coronal models. A method is suggested for analyzing line intensity ratio data from plasmas in the semi-coronal regime.

scholarly journals X-ray Lines From Mg VIII and Si X Ions and Their Diagnostic Use

1990 ◽  
Vol 115 ◽  
pp. 40-43
Author(s):  
Bhola N. Dwivedi
Keyword(s):  
Electron Density ◽  
Line Intensity ◽  
Coronal Holes ◽  
Emission Lines ◽  
X Ray ◽  
Quiet Sun ◽  
Diagnostic Use ◽  
Line Intensity Ratio ◽  
Theoretical Line ◽  
Intensity Ratios

AbstractThe solar X-ray emission lines from Mg VIII and Si X ions have been studied. The variation of theoretical line intensity ratio I(λ 75.03)/I(λ 74.86) from Mg VIII and I(λ 50.69)/I(λ 50.52) from Si X as a function of electron density is found to be good density monitors of the emitting regions of solar plasma. The computed values of line intensity from these ions based on Kopp and Orrall model have been used to derive electron density of the quiet Sun and coronal holes. The electron densities of 109 cm-3 and 4.6 × 108 cm-3 are estimated at the electron temperatures of 8 x 105 K and 1.6 x 106 K for the quiet Sun whereas the respective values of 5.4 x 108 cm-3 and 1.7 x 108 cm-3 are obtained for the coronal holes. The line intensity ratios studied here are independent of temperature variation and are therefore excellent candidates for electron density diagnostics. However, observational data with improved spectral resolution is needed for using X-ray line pairs studied for their diagnostic use.

scholarly journals Two-Dimensional Distribution of Electron Temperature in Ergodic Layer of LHD Measured from Line Intensity Ratio of CIV and NeVIII

2013 ◽  
Vol 8 (0) ◽  
pp. 2402176-2402176 ◽  
Author(s):  
Erhui WANG ◽  
Shigeru MORITA ◽  
Chunfeng DONG ◽  
Motoshi GOTO ◽  
Izumi MURAKAMI ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Line Intensity ◽  
Intensity Ratio ◽  
Two Dimensional ◽  
Line Intensity Ratio ◽  
Dimensional Distribution
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