Počet záznamů: 1
Height formation of bright points observed by IRIS in Mg II line wings during flux emergence
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SYSNO ASEP 0469490 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Height formation of bright points observed by IRIS in Mg II line wings during flux emergence Tvůrce(i) Grubecka, M. (PL)
Schmieder, B. (FR)
Berlicki, Arkadiusz (ASU-R) RID
Heinzel, Petr (ASU-R) RID, ORCID
Dalmasse, K. (US)
Mein, P. (FR)Zdroj.dok. Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 593, September (2016), A32/1-A32/17Poč.str. 17 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova Sun ; chromosphere ; activity Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) CEP GA16-18495S GA ČR - Grantová agentura ČR Institucionální podpora ASU-R - RVO:67985815 UT WOS 000385820100023 EID SCOPUS 84986882177 DOI https://doi.org/10.1051/0004-6361/201527358 Anotace A flux emergence in the active region AR 111850 was observed on September 24, 2013 with the Interface Region Imaging Spectrograph (IRIS). Many bright points are associated with the new emerging flux and show enhancement brightening in the UV spectra. The aim of this work is to compute the altitude formation of the compact bright points (CBs) observed in Mg II lines in the context of searching Ellerman bombs (EBs). Within the two IRIS rasters, 74 CBs are detected in the far wings of the Mg II lines (at +/-1 angstrom and 3.5 angstrom). Around 10% of CBs have a signature in Si IV and CII. NLTE models with a hotspot located in the low atmosphere were found to fit a sample of Mg II profiles in CBs. The H alpha profiles computed with these Mg II CB models are consistent with typical EB profiles observed from ground based telescopes e.g. THEMIS. A 2D NLTE modelling of fibrils (canopy) demonstrates that the Mg II line centres can be significantly affected but not the peaks and the wings of Mg II lines. We conclude that the bright points observed in Mg II lines can be formed in an extended domain of altitudes in the photosphere and/or the chromosphere (400 to 750 km). Our results are consistent with the theory of heating by Joule dissipation in the atmosphere produced by magnetic field reconnection during flux emergence.
Pracoviště Astronomický ústav Kontakt Anežka Melichárková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2017
Počet záznamů: 1