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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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).

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

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

Name of the periodical

Astronomy & Astrophysics

ISSN

1432-0746

e-ISSN

—

Volume of the periodical

631

Issue of the periodical within the volume

November

Country of publishing house

FR - FRANCE

Number of pages

12

Pages from-to

A146

UT code for WoS article

000499478000001

EID of the result in the Scopus database

2-s2.0-85076636587