dc.date.accessioned | 2017-08-14T13:07:20Z | |
dc.date.available | 2017-08-14T13:07:20Z | |
dc.date.created | 2015-06-17T10:20:12Z | |
dc.date.issued | 2015 | |
dc.identifier.citation | Stepan, J. Trujillo Bueno, J. Leenaarts, Jorrit Carlsson, Mats . Three-dimensional radiative transfer simulations of the scattering polarization of the hydrogen Lyα line in a magnetohydrodynamic model of the chromosphere-corona transition region. The Astrophysical Journal. 2015, 803(2) | |
dc.identifier.uri | http://hdl.handle.net/10852/56980 | |
dc.description.abstract | Probing the magnetism of the upper solar chromosphere requires measuring and modeling the scattering polarization produced by anisotropic radiation pumping in UV spectral lines. Here we apply PORTA ( a novel radiative transfer code ) to investigate the hydrogen Ly α line in a three-dimensional model of the solar atmosphere resulting from a state of the art magnetohydrodynamic ( MHD ) simulation. At full spatial resolution the linear polarization signals are very signi fi cant all over the solar disk, with a large fraction of the fi eld of view ( FOV ) showing line-center amplitudes well above the 1% level. Via the Hanle effect the line-center polarization signals are sensitive to the magnetic fi eld of the model ʼ s transition region, even when its mean fi eld strength is only 15 G. The breaking of the axial symmetry of the radiation fi eld produces signi fi cant forward-scattering polarization in Ly α , without the need of an inclined magnetic fi eld. Interestingly, the Hanle effect tends to decrease such forward-scattering polarization signals in most of the points of the FOV. When the spatial resolution is degraded, the line-center polarization of Ly α drops below the 1% level, reaching values similar to those previously found in one-dimensional ( 1D ) semi-empirical models ( i.e., up to about 0.5 % ) . The center to limb variation ( CLV ) of the spatially averaged polarization signals is qualitatively similar to that found in 1D models, with the largest line-center amplitudes at μ = cos θ ≈ 0. 4 ( θ being the heliocentric angle ). These results are important, both for designing the needed space-based instrumentation and for a reliable interpretation of future observations of the Ly α polarization.
Reproduced with permission from the Astrophysical Journal. © IOP Publishing | en_US |
dc.language | EN | |
dc.publisher | University of Chicago Press | |
dc.title | Three-dimensional radiative transfer simulations of the scattering polarization of the hydrogen Lyα line in a magnetohydrodynamic model of the chromosphere-corona transition region | en_US |
dc.type | Journal article | en_US |
dc.creator.author | Stepan, J. | |
dc.creator.author | Trujillo Bueno, J. | |
dc.creator.author | Leenaarts, Jorrit | |
dc.creator.author | Carlsson, Mats | |
cristin.unitcode | 185,15,3,0 | |
cristin.unitname | Institutt for teoretisk astrofysikk | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |
dc.identifier.cristin | 1248716 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The Astrophysical Journal&rft.volume=803&rft.spage=&rft.date=2015 | |
dc.identifier.jtitle | The Astrophysical Journal | |
dc.identifier.volume | 803 | |
dc.identifier.issue | 2 | |
dc.identifier.pagecount | 15 | |
dc.identifier.doi | http://dx.doi.org/10.1088/0004-637X/803/2/65 | |
dc.identifier.urn | URN:NBN:no-59727 | |
dc.type.document | Tidsskriftartikkel | en_US |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 0004-637X | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/56980/2/%25C5%25A0t%25C4%259Bp%25C3%25A1n_2015_ApJ_803_65.pdf | |
dc.type.version | PublishedVersion | |
cristin.articleid | 65 | |