Počet záznamů: 1

Multi-thermal atmosphere of a mini-solar flare during magnetic reconnection observed with IRIS

SYSNO ASEP	0548092
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Multi-thermal atmosphere of a mini-solar flare during magnetic reconnection observed with IRIS
Tvůrce(i)	Joshi, R. (IN) Schmieder, B. (FR) Tei, A. (JP) Aulanier, G. (FR) Lörinčík, Juraj (ASU-R)_ORCID Chandra, R. (IN) Heinzel, Petr (ASU-R)_{RID, ORCID}
Celkový počet autorů	7
Číslo článku	A80
Zdroj.dok.	Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361 Roč. 645, January (2021)
Poč.str.	19 s.
Forma vydání	Online - E
Jazyk dok.	eng - angličtina
Země vyd.	FR - Francie
Klíč. slova	variable source function ; cloud-model ; explosive events
Vědní obor RIV	BN - Astronomie a nebeská mechanika, astrofyzika
Obor OECD	Astronomy (including astrophysics,space science)
CEP	GA19-09489S GA ČR - Grantová agentura ČR
Způsob publikování	Open access
Institucionální podpora	ASU-R - RVO:67985815
UT WOS	000609886600001
EID SCOPUS	85099714631
DOI	10.1051/0004-6361/202039229
Anotace	The aim of this work is to study the fine structure and dynamics of the plasma at a jet base forming a mini-flare between two emerging magnetic fluxes (EMFs) observed with IRIS and the Solar Dynamics Observatory instruments.Methods. We proceed to a spatio-temporal analysis of IRIS spectra observed in the spectral ranges of Mg II, C II, and Si IV ions. Doppler velocities from Mg II lines were computed using a cloud model technique.Results. Strong asymmetric Mg II and C II line profiles with extended blue wings observed at the reconnection site (jet base) are interpreted by the presence of two chromospheric temperature clouds: one explosive cloud with blueshifts at 290 km s(-1) and one cloud with smaller Doppler shift (around 36 km s(-1)). Simultaneously at the same location (jet base), strong emission of several transition region lines (e.g. O IV and Si IV), emission of the Mg II triplet lines, and absorption of identified chromospheric lines in Si IV broad profiles have been observed and analysed.Conclusions. Such observations of IRIS line and continuum emissions allow us to propose a stratification model for the white light, mini-flare atmosphere with multiple layers of different temperatures along the line of sight in a reconnection current sheet. It is the first time that we could quantify the fast speed (possibly Alfvenic flows) of cool clouds ejected perpendicularly to the jet direction via the cloud model technique. We conjecture that the ejected clouds come from plasma which was trapped between the two EMFs before reconnection or be caused by chromospheric-temperature (cool) upflow material similar to a surge during reconnection.
Pracoviště	Astronomický ústav
Kontakt	Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326
Rok sběru	2022
Elektronická adresa	http://hdl.handle.net/11104/0324208

Počet záznamů: 1