dc.date.accessioned | 2020-05-08T18:53:30Z | |
dc.date.available | 2020-05-08T18:53:30Z | |
dc.date.created | 2020-01-06T14:49:20Z | |
dc.date.issued | 2019 | |
dc.identifier.citation | Hudson, Hugh S. MacKinnon, Alec Szydlarski, Mikolaj Marcin Carlsson, Mats . Cosmic ray interactions in the solar atmosphere. Monthly notices of the Royal Astronomical Society. 2019, 491(4), 4852-4856 | |
dc.identifier.uri | http://hdl.handle.net/10852/75263 | |
dc.description.abstract | High-energy particles enter the solar atmosphere from Galactic or solar coronal sources, and produce ‘albedo’ emission from the quiet Sun that is now observable across a wide range of photon energies. The interaction of high-energy particles in a stellar atmosphere depends essentially upon the joint variation of the magnetic field and plasma density, which heretofore has been characterized parametrically as P ∝ Bα with P the gas pressure and B the magnitude of the magnetic field. We re-examine that parametrization by using a self-consistent 3D MHD model (Bifrost) and show that this relationship tends to P ∝ B3.5 ± 0.1 based on the visible portions of the sample of open-field flux tubes in such a model, but with large variations from point to point. This scatter corresponds to the strong meandering of the open-field flux tubes in the lower atmosphere, which will have a strong effect on the prediction of the emission anisotropy (limb brightening). The simulations show that much of the open flux in coronal holes originates in weak-field regions within the granular pattern of the convective motions seen in the simulations. | |
dc.language | EN | |
dc.title | Cosmic ray interactions in the solar atmosphere | |
dc.type | Journal article | |
dc.creator.author | Hudson, Hugh S. | |
dc.creator.author | MacKinnon, Alec | |
dc.creator.author | Szydlarski, Mikolaj Marcin | |
dc.creator.author | Carlsson, Mats | |
cristin.unitcode | 185,15,3,40 | |
cristin.unitname | Rosseland senter for solfysikk | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 1 | |
dc.identifier.cristin | 1767009 | |
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=Monthly notices of the Royal Astronomical Society&rft.volume=491&rft.spage=4852&rft.date=2019 | |
dc.identifier.jtitle | Monthly notices of the Royal Astronomical Society | |
dc.identifier.volume | 491 | |
dc.identifier.issue | 4 | |
dc.identifier.startpage | 4852 | |
dc.identifier.endpage | 4856 | |
dc.identifier.doi | https://doi.org/10.1093/mnras/stz3373 | |
dc.identifier.urn | URN:NBN:no-78380 | |
dc.type.document | Tidsskriftartikkel | |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 0035-8711 | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/75263/2/stz3373.pdf | |
dc.type.version | PublishedVersion | |
dc.relation.project | NFR/262622 | |
dc.relation.project | NOTUR/NORSTORE/nn2834k | |