Počet záznamů: 1
Discovery of Scattering Polarization in the Hydrogen Ly alpha Line of the Solar Disk Radiation
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SYSNO ASEP 0479158 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Discovery of Scattering Polarization in the Hydrogen Ly alpha Line of the Solar Disk Radiation Tvůrce(i) Kano, R. (JP)
Trujillo Bueno, J. (ES)
Winebarger, A. (US)
Auchere, F. (FR)
Narukage, N. (JP)
Ishikawa, R. (JP)
Kobayashi, K. (US)
Bando, T. (JP)
Katsukawa, Y. (JP)
Kubo, M. (JP)
Ishikawa, S. (JP)
Giono, G. (JP)
Hara, H. (JP)
Suematsu, Y. (JP)
Shimizu, T. (CN)
Sakao, T. (US)
Tsuneta, S. (JP)
Ichimoto, K. (JP)
Goto, M. (JP)
Belluzzi, L. (ES)
Štěpán, Jiří (ASU-R) RID, ORCID
Asensio Ramos, A. (ES)
Sainz, R.M. (ES)
Champey, P. (FR)
Cirtain, J. (US)
de Pontieu, B. (US)
Casini, R. (US)
Carlsson, M. (SE)Celkový počet autorů 28 Zdroj.dok. Astrophysical Journal Letters. - : Institute of Physics Publishing - ISSN 2041-8205
Roč. 839, č. 1 (2017), L10/1-L10/6Poč.str. 6 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova vacuum-ultraviolet spectropolarimeter ; transition region ; chromosphere Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) Institucionální podpora ASU-R - RVO:67985815 UT WOS 000399283000002 EID SCOPUS 85017688700 DOI 10.3847/2041-8213/aa697f Anotace There is a thin transition region (TR) in the solar atmosphere where the temperature rises from 10,000 K in the chromosphere to millions of degrees in the corona. Little is known about the mechanisms that dominate this enigmatic region other than the magnetic field plays a key role. The magnetism of the TR can only be detected by polarimetric measurements of a few ultraviolet (UV) spectral lines, the Ly alpha line of neutral hydrogen at 121.6. nm (the strongest line of the solar UV spectrum) being of particular interest given its sensitivity to the Hanle effect (the magnetic-field-induced modification of the scattering line polarization). We report the discovery of linear polarization produced by scattering processes in the Ly alpha line, obtained with the Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP) rocket experiment. The Stokes profiles observed by CLASP in quiet regions of the solar disk show that the Q/I and U/I linear polarization signals are of the order of 0.1% in the line core and up to a few percent in the nearby wings, and that both have conspicuous spatial variations with scales of similar to 10. arcsec. These observations help constrain theoretical models of the chromosphere-corona TR and extrapolations of the magnetic field from photospheric magnetograms. In fact, the observed spatial variation from disk to limb of polarization at the line core and wings already challenge the predictions from three-dimensional magnetohydrodynamical models of the upper solar chromosphere. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2018
Počet záznamů: 1