Počet záznamů: 1  

Quiet Sun Center to Limb Variation of the Linear Polarization Observed by CLASP2 Across the Mg ii h and k Lines

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    SYSNO ASEP0561049
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevQuiet Sun Center to Limb Variation of the Linear Polarization Observed by CLASP2 Across the Mg ii h and k Lines
    Tvůrce(i) Rachmeler, L. A. (US)
    Trujillo Bueno, J. (ES)
    McKenzie, D. E. (US)
    Štěpán, Jiří (ASU-R) RID, ORCID
    Celkový počet autorů28
    Číslo článku67
    Zdroj.dok.Astrophysical Journal - ISSN 0004-637X
    Roč. 936, č. 1 (2022)
    Poč.str.9 s.
    Forma vydáníOnline - E
    Jazyk dok.eng - angličtina
    Země vyd.GB - Velká Británie
    Klíč. slovasolar chromosphere ; center to limb observations ; spectropolarimetry
    Vědní obor RIVBN - Astronomie a nebeská mechanika, astrofyzika
    Obor OECDAstronomy (including astrophysics,space science)
    Způsob publikováníOpen access
    Institucionální podporaASU-R - RVO:67985815
    UT WOS000847886100001
    EID SCOPUS85137393692
    DOI10.3847/1538-4357/ac83b8
    AnotaceThe CLASP2 (Chromospheric LAyer Spectro-Polarimeter 2) sounding rocket mission was launched on 2019 April 11. CLASP2 measured the four Stokes parameters of the Mg ii h and k spectral region around 2800 angstrom along a 200 '' slit at three locations on the solar disk, achieving the first spatially and spectrally resolved observations of the solar polarization in this near-ultraviolet region. The focus of the work presented here is the center-to-limb variation of the linear polarization across these resonance lines, which is produced by the scattering of anisotropic radiation in the solar atmosphere. The linear polarization signals of the Mg ii h and k lines are sensitive to the magnetic field from the low to the upper chromosphere through the Hanle and magneto-optical effects. We compare the observations to theoretical predictions from radiative transfer calculations in unmagnetized semiempirical models, arguing that magnetic fields and horizontal inhomogeneities are needed to explain the observed polarization signals and spatial variations. This comparison is an important step in both validating and refining our understanding of the physical origin of these polarization signatures, and also in paving the way toward future space telescopes for probing the magnetic fields of the solar upper atmosphere via ultraviolet spectropolarimetry.
    PracovištěAstronomický ústav
    KontaktRadka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326
    Rok sběru2023
    Elektronická adresahttps://hdl.handle.net/11104/0334242
Počet záznamů: 1  

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