Formation of Si iv due to the interaction of an electron beam with the flaring solar chromosphere

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00641292" target="_blank" >RIV/67985815:_____/25:00641292 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0371533" target="_blank" >https://hdl.handle.net/11104/0371533</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202556009" target="_blank" >10.1051/0004-6361/202556009</a>

Result language

angličtina

Original language name

Formation of Si iv due to the interaction of an electron beam with the flaring solar chromosphere

Original language description

We modeled Si IV emission at the footpoints of flaring loops to evaluate the effects of the electron beam, non-equilibrium ionization, and suppression of dielectronic recombination. Methods. The radiation-hydrodynamic code FLARIX was used to model the properties of plasma in solar flare ribbons. Energy was deposited via short-duration electron beams with a triangular profile in time, peaking at 1, 3, or 5 s, and with an energy flux ranging from 1 to 9 x 10(10) cm(-2) s(-1). Subsequently, we calculated the non-equilibrium ionization states of silicon, taking into account the non-Maxwellian electron distribution containing the electron beam component. The Si IV line intensities and their evolution in time were modeled using a 161-level CHIANTI ion model. Results. We found that the maximum of Si IV emissivity occurs in a hot bubble formed at the location of the maximum of beam energy deposition. The non-equilibrium abundances of Si IV were found to differ from those of the equilibrium by more than one order of magnitude. The ionization by the electron beam has only a small effect on the Si IV emissivity, typically below 10%. However, the effect of density suppression of dielectronic recombination is much more important, as the emissivities calculated without it can be several times lower than when this effect is included. Overall, the main contribution to the total intensity of Si IV lines along the flare loop comes from the hot bubble in optically thin cases or from plasma above this bubble when the plasma is optically thick. Conclusions. Non-equilibrium ionization and density suppression of dielectronic recombination are found to be important effects influencing the modeled ionization states of the flaring plasma and the resulting Si IV emissivities. For short-duration electron beams, the maximum of the emissivity corresponds to the position of the hot bubble.

Czech name

—

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

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA22-07155S" target="_blank" >GA22-07155S: Modeling and observable features of non-equilibrium processes in the solar spectra</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

702

Issue of the periodical within the volume

Oct.

Country of publishing house

FR - FRANCE

Number of pages

11

Pages from-to

A231

UT code for WoS article

001599834100007

EID of the result in the Scopus database

2-s2.0-105020670326