Importance of Angle-dependent Partial Frequency Redistribution in Hyperfine Structure Transitions Under the Incomplete Paschen-Back Effect Regime
Informazioni aggiuntive
Autori
Nagendra K. N.,
Sowmya K.,
Sampoorna M.,
Stenflo J. O.,
Anusha L. S.
Tipo
Articolo pubblicato in rivista scientifica
Anno
2020
Lingua
Inglese
Sommario
Angle-frequency coupling in scattering of polarized light on atoms is represented by the angle-dependent (AD) partial frequency redistribution (PRD) matrices. There are several lines in the linearly polarized solar spectrum, for which PRD combined with quantum interference between hyperfine structure states play a significant role. Here we present the solution of the polarized line transfer equation including the AD-PRD matrix for scattering on a two-level atom with hyperfine structure splitting and an unpolarized lower level. We account for the effects of arbitrary magnetic fields (including the incomplete Paschen-Back effect regime) and elastic collisions. For exploratory purposes we consider a self-emitting isothermal planar atmosphere and use atomic parameters that represent an isolated Na I D$_2$ line. For this case we show that the AD- PRD effects are significant for field strengths below about 30 G, but that the computationally much less demanding approximation of angle-averaged PRD may be used for stronger fields.
Parole chiave
irsol-refereed-scientific-papers
Periodico
Astrophysical Journal
Volume
898
Numero ( Mese )
1
Pagine (o numero dell’articolo)
49
