Počet záznamů: 1
Understanding the HMI Pseudocontinuum in White-light Solar Flares
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SYSNO ASEP 0495487 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Understanding the HMI Pseudocontinuum in White-light Solar Flares Tvůrce(i) Švanda, Michal (ASU-R) RID, ORCID
Jurčák, Jan (ASU-R) RID, ORCID
Kašparová, Jana (ASU-R) RID, ORCID
Kleint, L. (CH)Číslo článku 144 Zdroj.dok. Astrophysical Journal - ISSN 0004-637X
Roč. 860, č. 2 (2018)Poč.str. 9 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova Sun ; activity ; flares Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) CEP GA16-18495S GA ČR - Grantová agentura ČR GA18-06319S GA ČR - Grantová agentura ČR Institucionální podpora ASU-R - RVO:67985815 UT WOS 000436072400006 EID SCOPUS 85049225362 DOI 10.3847/1538-4357/aac3e4 Anotace We analyze observations of the X9.3 solar flare (SOL2017-09-06T11:53) observed by SDO/HMI and Hinode/Solar Optical Telescope. Our aim is to learn about the nature of the HMI pseudocontinuum I-c used as a proxy for the white-light continuum. From model atmospheres retrieved by an inversion code applied to the Stokes profiles observed by the Hinode satellite, we synthesize profiles of the FeI 617.3 nm line and compare them to HMI observations. Based on a pixel-by-pixel comparison, we show that the value of I-c represents the continuum level well in quiet-Sun regions only. In magnetized regions, it suffers from a simplistic algorithm that is applied to a complex line shape. During this flare, both instruments also registered emission profiles in the flare ribbons. Such emission profiles are poorly represented by the six spectral points of HMI and the MDI-like algorithm does not account for emission profiles in general, thus, the derived pseudocontinuum intensity does not approximate the continuum value properly. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2019
Počet záznamů: 1