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Statements

Subject Item
n2:RIV%2F67985815%3A_____%2F14%3A00399493%21RIV15-GA0-67985815
rdf:type
skos:Concept n13:Vysledek
dcterms:description
The formation of the transition region O IV and Si IV lines observable by the Interface Region Imaging Spectrograph (IRIS) is investigated for both Maxwellian and non-Maxwellian conditions characterized by a κ-distribution exhibiting a high-energy tail. The Si IV lines are formed at lower temperatures than the O IV lines for all κ. In non-Maxwellian situations with lower κ, the contribution functions are shifted to lower temperatures. Combined with the slope of the differential emission measure, it is possible for the Si IV lines to be formed at very different regions of the solar transition region than the O IV lines; possibly close to the solar chromosphere. Such situations might be discernible by IRIS. It is found that photoexcitation can be important for the Si IV lines, but is negligible for the O IV lines. The usefulness of the O IV ratios for density diagnostics independently of κ is investigated and it is found that the O IV 1404.78 Å/1399.77 Å ratio provides a good density diagnostics except for very low T combined with extreme non-Maxwellian situations. The formation of the transition region O IV and Si IV lines observable by the Interface Region Imaging Spectrograph (IRIS) is investigated for both Maxwellian and non-Maxwellian conditions characterized by a κ-distribution exhibiting a high-energy tail. The Si IV lines are formed at lower temperatures than the O IV lines for all κ. In non-Maxwellian situations with lower κ, the contribution functions are shifted to lower temperatures. Combined with the slope of the differential emission measure, it is possible for the Si IV lines to be formed at very different regions of the solar transition region than the O IV lines; possibly close to the solar chromosphere. Such situations might be discernible by IRIS. It is found that photoexcitation can be important for the Si IV lines, but is negligible for the O IV lines. The usefulness of the O IV ratios for density diagnostics independently of κ is investigated and it is found that the O IV 1404.78 Å/1399.77 Å ratio provides a good density diagnostics except for very low T combined with extreme non-Maxwellian situations.
dcterms:title
Solar Transition-Region Lines Observed by the Interface Region Imaging Spectrograph: Diagnostics for the O IV and Si IV Lines Solar Transition-Region Lines Observed by the Interface Region Imaging Spectrograph: Diagnostics for the O IV and Si IV Lines
skos:prefLabel
Solar Transition-Region Lines Observed by the Interface Region Imaging Spectrograph: Diagnostics for the O IV and Si IV Lines Solar Transition-Region Lines Observed by the Interface Region Imaging Spectrograph: Diagnostics for the O IV and Si IV Lines
skos:notation
RIV/67985815:_____/14:00399493!RIV15-GA0-67985815
n3:aktivita
n15:I n15:P
n3:aktivity
I, P(GAP209/12/1652)
n3:cisloPeriodika
1
n3:dodaniDat
n12:2015
n3:domaciTvurceVysledku
n9:2841444 n9:3166821
n3:druhVysledku
n14:J
n3:duvernostUdaju
n5:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
45859
n3:idVysledku
RIV/67985815:_____/14:00399493
n3:jazykVysledku
n11:eng
n3:klicovaSlova
atomic data; atomic processes; radiation mechanisms
n3:klicoveSlovo
n7:atomic%20data n7:radiation%20mechanisms n7:atomic%20processes
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[62E9E313A940]
n3:nazevZdroje
Astrophysical Journal Letters
n3:obor
n16:BN
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
5
n3:projekt
n6:GAP209%2F12%2F1652
n3:rokUplatneniVysledku
n12:2014
n3:svazekPeriodika
780
n3:tvurceVysledku
Dudík, Jaroslav Mason, H. E. Del Zanna, G. Golub, L. Dzifčáková, Elena
n3:wos
000328261500012
s:issn
2041-8205
s:numberOfPages
7
n4:doi
10.1088/2041-8205/780/1/L12