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Understanding the HMI Pseudocontinuum in White-light Solar Flares
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SYSNO ASEP 0495487 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Understanding the HMI Pseudocontinuum in White-light Solar Flares Author(s) Švanda, Michal (ASU-R) RID, ORCID
Jurčák, Jan (ASU-R) RID, ORCID
Kašparová, Jana (ASU-R) RID, ORCID
Kleint, L. (CH)Article number 144 Source Title Astrophysical Journal - ISSN 0004-637X
Roč. 860, č. 2 (2018)Number of pages 9 s. Publication form Online - E Language eng - English Country US - United States Keywords Sun ; activity ; flares Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects GA16-18495S GA ČR - Czech Science Foundation (CSF) GA18-06319S GA ČR - Czech Science Foundation (CSF) Institutional support ASU-R - RVO:67985815 UT WOS 000436072400006 EID SCOPUS 85049225362 DOI 10.3847/1538-4357/aac3e4 Annotation 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. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2019
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