Fe XXI emission line ratios as electron temperature diagnostics for the coronae of cool stars

Solar Physics ◽  
1996 ◽  
Vol 169 (1) ◽  
pp. 47-53 ◽  
Author(s):  
F. P. Keenan ◽  
V. J. Foster ◽  
K. M. Aggarwal ◽  
K. G. Widing
Keyword(s):  
Emission Line ◽  
Electron Temperature ◽  
Cool Stars ◽  
Temperature Diagnostics

The 1 1S-n 1 P/1 1S-2 1 P emission-line ratios in SI XIII as electron temperature diagnostics for solar flares and active regions

1990 ◽  
Vol 363 ◽  
pp. 310 ◽  
Author(s):  
F. P. Keenan ◽  
S. M. McCann ◽  
K. J. H. Phillips
Keyword(s):  
Emission Line ◽  
Electron Temperature ◽  
Solar Flares ◽  
Active Regions ◽  
Temperature Diagnostics

X-ray emission-line ratios in MG XI as electron temperature diagnostics for solar flares and active regions

1992 ◽  
Vol 393 ◽  
pp. 815 ◽  
Author(s):  
F. P. Keenan ◽  
K. J. H. Phillips ◽  
L. K. Harra ◽  
E. S. Conlon ◽  
A. E. Kingston
Keyword(s):  
Emission Line ◽  
Electron Temperature ◽  
Solar Flares ◽  
Active Regions ◽  
X Ray ◽  
Temperature Diagnostics

scholarly journals The SAMI Galaxy Survey: reconciling strong emission line metallicity diagnostics using metallicity gradients

2021 ◽  
Vol 502 (3) ◽  
pp. 3357-3373
Author(s):  
Henry Poetrodjojo ◽  
Brent Groves ◽  
Lisa J Kewley ◽  
Sarah M Sweet ◽  
Sebastian F Sanchez ◽  
...  
Keyword(s):  
Emission Line ◽  
Electron Temperature ◽  
Gas Phase ◽  
Mass Range ◽  
Accurate Method ◽  
Emission Lines ◽  
Mass Relation ◽  
Strong Emission ◽  
Data Release ◽  
Accurate Comparison

ABSTRACT We measure the gas-phase metallicity gradients of 248 galaxies selected from Data Release 2 of the SAMI Galaxy Survey. We demonstrate that there are large systematic discrepancies between the metallicity gradients derived using common strong emission line metallicity diagnostics. We determine which pairs of diagnostics have Spearman’s rank coefficients greater than 0.6 and provide linear conversions to allow the accurate comparison of metallicity gradients derived using different strong emission line diagnostics. For galaxies within the mass range 8.5 < log (M/M⊙) < 11.0, we find discrepancies of up to 0.11 dex/Re between seven popular diagnostics in the metallicity gradient–mass relation. We find a suggestion of a break in the metallicity gradient–mass relation, where the slope shifts from negative to positive, occurs between 9.5 < log (M/M⊙) < 10.5 for the seven chosen diagnostics. Applying our conversions to the metallicity gradient–mass relation, we reduce the maximum dispersion from 0.11 dex/Re to 0.02 dex/Re. These conversions provide the most accurate method of converting metallicity gradients when key emission lines are unavailable. We find that diagnostics that share common sets of emission line ratios agree best, and that diagnostics calibrated through the electron temperature provide more consistent results compared to those calibrated through photoionization models.

Electron temperature diagnostics of aluminium plasma in a z -pinch experiment at the “QiangGuang-1" facility

2012 ◽  
Vol 21 (12) ◽  
pp. 125202 ◽  
Author(s):  
Mo Li ◽  
Jian Wu ◽  
Liang-Ping Wang ◽  
Gang Wu ◽  
Juan-Juan Han ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Diagnostics ◽  
Z Pinch

Electron temperature and density sensitive X-ray emission line ratios for CI XVI

1993 ◽  
Vol 47 (2) ◽  
pp. 169-174 ◽  
Author(s):  
I H Coffey ◽  
F P Keenan ◽  
C E McAdam ◽  
R Barnsley ◽  
W J Dickson ◽  
...  
Keyword(s):  
Emission Line ◽  
Electron Temperature ◽  
X Ray

Si III electron temperature diagnostics for the solar transition region

Solar Physics ◽  
1989 ◽  
Vol 123 (1) ◽  
pp. 33-39 ◽  
Author(s):  
F. P. Keenan ◽  
P. L. Dufton ◽  
A. E. Kingston
Keyword(s):  
Electron Temperature ◽  
Transition Region ◽  
Solar Transition Region ◽  
Solar Transition ◽  
Temperature Diagnostics

A new principle in plasma electron-temperature diagnostics using a semiconductor x-ray detector

1999 ◽  
Vol 7 (2) ◽  
pp. 85-92
Author(s):  
T. Cho ◽  
J. Kohagura ◽  
M. Hirata ◽  
Y. Sakamoto ◽  
T. Okamura ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Plasma Electron ◽  
X Ray ◽  
Temperature Diagnostics

scholarly journals Solar EUV Rocket Telescope and Spectrograph (SERTS) Observations of Fe XII Emission Lines

1996 ◽  
Vol 152 ◽  
pp. 531-536
Author(s):  
F.P. Keenan ◽  
R.J. Thomas ◽  
W.M. Neupert ◽  
V.J. Foster ◽  
C.J. Greer ◽  
...  
Keyword(s):  
Active Region ◽  
Emission Line ◽  
Electron Temperature ◽  
Observational Data ◽  
Electron Density ◽  
Wavelength Range ◽  
Solar Spectrum ◽  
Emission Lines ◽  
First Time ◽  
Good Agreement

Abstract.Theoretical electron density sensitive emission line ratios involving transitions in the 186–383 Å wavelength range are compared with observational data for a solar active region and a subflare, obtained by the Solar EUV Rocket Telescope and Spectrograph (SERTS). Electron densities derived from the majority of the ratios are consistent with one another, and are also in good agreement with the values of density estimated from diagnostic lines in other species formed at similar temperatures to Fe XII. These results provide observational support for the general accuracy of the diagnostic calculations. In addition, our analysis indicates that a line at 283.70 Å in the active region spectrum is the 3s23p32D3/2−3s3p42P1/2 transition in Fe XII, the first time (to the best of our knowledge) that this line has been identified in the solar spectrum. Several of the line ratios considered are predicted to be relatively insensitive to the adopted electron temperature and density, and the generally good agreement found between theory and observation for these provides evidence for the reliability of the SERTS instrument calibration. The application of the Fe XII diagnostics to EUVE observations of the F5 subgiant Procyon is briefly discussed.

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