Determination of the physical properties of an erupting prominence from SOHO/LASCO and UVCS observations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00519293" target="_blank" >RIV/67985815:_____/19:00519293 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0304292" target="_blank" >http://hdl.handle.net/11104/0304292</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1393/ncc/i2019-19037-6" target="_blank" >10.1393/ncc/i2019-19037-6</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Determination of the physical properties of an erupting prominence from SOHO/LASCO and UVCS observations

Popis výsledku v původním jazyce

We studied the physical conditions of an erupting prominence observed in the core of a coronal mass ejection, using combination of SOHO/LASCO-C2 visible-light images and SOHO/UVCS ultraviolet data. Measured intensities and profiles of the neutral-hydrogen Lyman-alpha and Lyman-beta lines and the 977 angstrom C III line were used together with the visible-light brightness to derive the geometrical and physical parameters of the prominence, such as the line-of-sight apparent thickness. electron column density, kinetic temperature, and microturbolent velocity. These parameters were used to constrain a non-LTE (i.e., out of local thermodynamic equilibrium) radiative-transfer model of the prominence that provides the effective thickness, electron density, and flow velocity, in a sample of points selected along the prominence. The prominence can be described as a hot structure with low electron density and very low gas pressure compared to typical quiescent prominences. Intensities of the hydrogen lines were also used for a detailed determination of the plasma line-of-sight filling factor, in the two prominence points where simultaneous and cospatial LASCO-C2 and UVCS observations were available.

Název v anglickém jazyce

Determination of the physical properties of an erupting prominence from SOHO/LASCO and UVCS observations

Popis výsledku anglicky

We studied the physical conditions of an erupting prominence observed in the core of a coronal mass ejection, using combination of SOHO/LASCO-C2 visible-light images and SOHO/UVCS ultraviolet data. Measured intensities and profiles of the neutral-hydrogen Lyman-alpha and Lyman-beta lines and the 977 angstrom C III line were used together with the visible-light brightness to derive the geometrical and physical parameters of the prominence, such as the line-of-sight apparent thickness. electron column density, kinetic temperature, and microturbolent velocity. These parameters were used to constrain a non-LTE (i.e., out of local thermodynamic equilibrium) radiative-transfer model of the prominence that provides the effective thickness, electron density, and flow velocity, in a sample of points selected along the prominence. The prominence can be described as a hot structure with low electron density and very low gas pressure compared to typical quiescent prominences. Intensities of the hydrogen lines were also used for a detailed determination of the plasma line-of-sight filling factor, in the two prominence points where simultaneous and cospatial LASCO-C2 and UVCS observations were available.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

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

Nuovo Cimento

ISSN

1826-9885

e-ISSN

—

Svazek periodika

42

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

3

Strana od-do

37

Kód UT WoS článku

000471216600010

EID výsledku v databázi Scopus

2-s2.0-85068614590