Počet záznamů: 1
Multi-thermal atmosphere of a mini-solar flare during magnetic reconnection observed with IRIS
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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, ORCIDCelkový 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