Hide metadata

dc.date.accessioned2020-05-08T18:47:35Z
dc.date.available2020-05-08T18:47:35Z
dc.date.created2020-01-06T15:02:41Z
dc.date.issued2019
dc.identifier.citationLia, Jiajia Carlsson, Mats Nelson, Chris J. Erdélyi, Robert . Co-spatial velocity and magnetic swirls in the simulated solar photosphere. Astronomy and Astrophysics. 2019, 632
dc.identifier.urihttp://hdl.handle.net/10852/75260
dc.description.abstractContext. Velocity or intensity swirls have now been shown to be widely present throughout the photosphere and chromosphere. It has been suggested that these events could contribute to the heating of the upper solar atmosphere, via exciting Alfvén pulses, which could carry significant amounts of energy. However, the conjectured necessary physical conditions for their excitation, that the magnetic field rotates co-spatially and co-temporally with the velocity field, has not been verified. Aims. We aim to understand whether photospheric velocity swirls exist co-spatially and co-temporally with photospheric magnetic swirls, in order to demonstrate the link between swirls and pulses. Methods. The automated swirl detection algorithm (ASDA) is applied to the photospheric horizontal velocity and vertical magnetic fields obtained from a series of realistic numerical simulations using the radiative magnetohydrodynamics (RMHD) code Bifrost. The spatial relationship between the detected velocity and magnetic swirls is further investigated via a well-defined correlation index (CI) study. Results. On average, there are ∼63 short-lived photospheric velocity swirls (with lifetimes mostly less than 20 s, and average radius of ∼37 km and rotating speeds of ∼2.5 km s−1) detected in a field of view (FOV) of 6 × 6 Mm−2, implying a total population of velocity swirls of ∼1.06 × 107 in the solar photosphere. More than 80% of the detected velocity swirls are found to be accompanied by local magnetic concentrations in intergranular lanes. On average, ∼71% of the detected velocity swirls have been found to co-exist with photospheric magnetic swirls with the same rotating direction. Conclusions. The co-temporal and co-spatial rotation in the photospheric velocity and magnetic fields provide evidence that the conjectured condition for the excitation of Alfvén pulses by photospheric swirls is fulfilled.
dc.languageEN
dc.titleCo-spatial velocity and magnetic swirls in the simulated solar photosphere
dc.typeJournal article
dc.creator.authorLia, Jiajia
dc.creator.authorCarlsson, Mats
dc.creator.authorNelson, Chris J.
dc.creator.authorErdélyi, Robert
cristin.unitcode185,15,3,40
cristin.unitnameRosseland senter for solfysikk
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.cristin1767036
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy and Astrophysics&rft.volume=632&rft.spage=&rft.date=2019
dc.identifier.jtitleAstronomy and Astrophysics
dc.identifier.volume632
dc.identifier.pagecount8
dc.identifier.doihttps://doi.org/10.1051/0004-6361/201936882
dc.identifier.urnURN:NBN:no-78370
dc.type.documentTidsskriftartikkel
dc.type.peerreviewedPeer reviewed
dc.source.issn0004-6361
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/75260/1/aa36882-19.pdf
dc.type.versionPublishedVersion
cristin.articleidA97
dc.relation.projectNFR/262622
dc.relation.projectNOTUR/NORSTORE/NN2834K


Files in this item

Appears in the following Collection

Hide metadata