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dc.date.accessioned2018-02-16T09:46:53Z
dc.date.available2018-02-16T09:46:53Z
dc.date.created2017-08-01T10:45:54Z
dc.date.issued2017
dc.identifier.citationKano, R. Trujillo Bueno, J. Winebarger, A. Auchère, F. Narukage, N. Ishikawa, R. Kobayashi, K. Bando, T. Katsukawa, Y. Kubo, M. Ishikawa, S. Giono, G. Hara, H. Suematsu, Y. Shimizu, T. Sakao, T. Tsuneta, S. Ichimoto, K. Goto, M. Belluzzi, L. Stepan, Jiri Asensio Ramos, A. Manso Sainz, R. Champey, P. Cirtain, J. De Pontieu, Bart Walter Casini, R. Carlsson, Mats . Discovery of Scattering Polarization in the Hydrogen Lyα Line of the Solar Disk Radiation. Astrophysical Journal Letters. 2017, 839(1)
dc.identifier.urihttp://hdl.handle.net/10852/60155
dc.description.abstractThere 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 Lyα 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 Lyα 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 ~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. © 2017. The American Astronomical Society. All rights reserved.en_US
dc.languageEN
dc.language.isoenen_US
dc.publisherInstitute of Physics Publishing Ltd.
dc.titleDiscovery of Scattering Polarization in the Hydrogen Lyα Line of the Solar Disk Radiationen_US
dc.typeJournal articleen_US
dc.creator.authorKano, R.
dc.creator.authorTrujillo Bueno, J.
dc.creator.authorWinebarger, A.
dc.creator.authorAuchère, F.
dc.creator.authorNarukage, N.
dc.creator.authorIshikawa, R.
dc.creator.authorKobayashi, K.
dc.creator.authorBando, T.
dc.creator.authorKatsukawa, Y.
dc.creator.authorKubo, M.
dc.creator.authorIshikawa, S.
dc.creator.authorGiono, G.
dc.creator.authorHara, H.
dc.creator.authorSuematsu, Y.
dc.creator.authorShimizu, T.
dc.creator.authorSakao, T.
dc.creator.authorTsuneta, S.
dc.creator.authorIchimoto, K.
dc.creator.authorGoto, M.
dc.creator.authorBelluzzi, L.
dc.creator.authorStepan, Jiri
dc.creator.authorAsensio Ramos, A.
dc.creator.authorManso Sainz, R.
dc.creator.authorChampey, P.
dc.creator.authorCirtain, J.
dc.creator.authorDe Pontieu, Bart Walter
dc.creator.authorCasini, R.
dc.creator.authorCarlsson, Mats
cristin.unitcode185,15,3,0
cristin.unitnameInstitutt for teoretisk astrofysikk
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.cristin1483579
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astrophysical Journal Letters&rft.volume=839&rft.spage=&rft.date=2017
dc.identifier.jtitleAstrophysical Journal Letters
dc.identifier.volume839
dc.identifier.issue1
dc.identifier.pagecount6
dc.identifier.doihttp://dx.doi.org/10.3847/2041-8213/aa697f
dc.identifier.urnURN:NBN:no-62814
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn2041-8205
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/60155/2/Kano%252BTrujillo%2BBueno%252BWinebarger%252BAuch%25C3%25A8re%252Betal2017.pdf
dc.type.versionPublishedVersion
cristin.articleidL10
dc.relation.projectNOTUR/NORSTORE/nn2834k
dc.relation.projectNFR/251369
dc.relation.projectNFR/230938


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