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

The l(1)S-n(1)P/1(1)S-2(1)P emission-line ratios in O VII as temperature diagnostics for solar flares and active regions

1985 ◽  
Vol 291 ◽  
pp. 855 ◽  
Author(s):  
F. P. Keenan ◽  
A. E. Kingston ◽  
D. L. McKenzie
Keyword(s):  
Emission Line ◽  
Solar Flares ◽  
Active Regions ◽  
Temperature Diagnostics

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

Evidence for a Cutoff in the Frequency Distribution of Solar Flares from Small Active Regions

1997 ◽  
Vol 475 (1) ◽  
pp. 338-347 ◽  
Author(s):  
T. A. Kucera ◽  
B. R. Dennis ◽  
R. A. Schwartz ◽  
D. Shaw
Keyword(s):  
Frequency Distribution ◽  
Solar Flares ◽  
Active Regions

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.

Peculiarities of the microwave emission from active regions generating intense solar flares

2003 ◽  
Vol 29 (4) ◽  
pp. 263-273 ◽  
Author(s):  
V. M. Bogod ◽  
S. Kh. Tokhchukova
Keyword(s):  
Solar Flares ◽  
Active Regions ◽  
Microwave Emission

A Study of Connections Between Solar Flares and Subsurface Flow Fields of Active Regions

2013 ◽  
pp. 57-66
Author(s):  
Yu Gao ◽  
Junwei Zhao ◽  
Hongqi Zhang
Keyword(s):  
Solar Flares ◽  
Subsurface Flow ◽  
Active Regions ◽  
Flow Fields
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