2D non-LTE modelling of a filament observed in the H alpha line with the DST/IBIS spectropolarimeter

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00520568" target="_blank" >RIV/67985815:_____/19:00520568 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1051/0004-6361/201935358" target="_blank" >https://doi.org/10.1051/0004-6361/201935358</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201935358" target="_blank" >10.1051/0004-6361/201935358</a>

Jazyk výsledku

angličtina

Název v původním jazyce

2D non-LTE modelling of a filament observed in the H alpha line with the DST/IBIS spectropolarimeter

Popis výsledku v původním jazyce

We analyse the spectral observations obtained in the H alpha line to derive the thermodynamic properties of the plasma of the observed fragment of the filament. Methods. We used a 2D filament model employing radiative transfer computations under conditions that depart from the local thermodynamic equilibrium. We employed a forward modelling technique in which we used the 2D model to produce synthetic H alpha line profiles that we compared with the observations. We then found the set of model input parameters, which produces synthetic spectra with the best agreement with observations. Our analysis shows that one part of the observed fragment of the filament is cooler, denser, and more dynamic than its other part that is hotter, less dense, and more quiescent. The derived temperatures in the first part range from 6000 K to 10 000 K and in the latter part from 11 000 K to 14 000 K. The gas pressure is 0.2-0.4 dyn cm(-2) in the first part and around 0.15 dyn cm(-2) in the latter part. The more dynamic nature of the first part is characterised by the line-of-sight velocities with absolute values of 6-7 km s(-1) and microturbulent velocities of 8-9 km s(-1). On the other hand, the latter part exhibits line-of-sight velocities with absolute values 0-2.5 km s(-1) and microturbulent velocities of 4-6 km s(-1).

Název v anglickém jazyce

2D non-LTE modelling of a filament observed in the H alpha line with the DST/IBIS spectropolarimeter

Popis výsledku anglicky

We analyse the spectral observations obtained in the H alpha line to derive the thermodynamic properties of the plasma of the observed fragment of the filament. Methods. We used a 2D filament model employing radiative transfer computations under conditions that depart from the local thermodynamic equilibrium. We employed a forward modelling technique in which we used the 2D model to produce synthetic H alpha line profiles that we compared with the observations. We then found the set of model input parameters, which produces synthetic spectra with the best agreement with observations. Our analysis shows that one part of the observed fragment of the filament is cooler, denser, and more dynamic than its other part that is hotter, less dense, and more quiescent. The derived temperatures in the first part range from 6000 K to 10 000 K and in the latter part from 11 000 K to 14 000 K. The gas pressure is 0.2-0.4 dyn cm(-2) in the first part and around 0.15 dyn cm(-2) in the latter part. The more dynamic nature of the first part is characterised by the line-of-sight velocities with absolute values of 6-7 km s(-1) and microturbulent velocities of 8-9 km s(-1). On the other hand, the latter part exhibits line-of-sight velocities with absolute values 0-2.5 km s(-1) and microturbulent velocities of 4-6 km s(-1).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy & Astrophysics

ISSN

1432-0746

e-ISSN

—

Svazek periodika

631

Číslo periodika v rámci svazku

November

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

12

Strana od-do

A146

Kód UT WoS článku

000499478000001

EID výsledku v databázi Scopus

2-s2.0-85076636587