Hide metadata

dc.date.accessioned2018-08-23T11:35:33Z
dc.date.available2018-08-23T11:35:33Z
dc.date.created2018-06-22T09:46:03Z
dc.date.issued2018
dc.identifier.citationAntolin, Patrick Schmit, D. Pereira, Tiago Mendes Domingos De Pontieu, Bart Walter De Moortel, I. . Transverse Wave Induced Kelvin-Helmholtz Rolls in Spicules. Astrophysical Journal. 2018, 856(1)
dc.identifier.urihttp://hdl.handle.net/10852/63632
dc.description.abstractIn addition to their jet-like dynamic behavior, spicules usually exhibit strong transverse speeds, multi-stranded structure, and heating from chromospheric to transition region temperatures. In this work we first analyze Hinode and IRIS observations of spicules and find different behaviors in terms of their Doppler velocity evolution and collective motion of their sub-structure. Some have a Doppler shift sign change that is rather fixed along the spicule axis, and lack coherence in the oscillatory motion of strand-like structure, matching rotation models, or long-wavelength torsional Alfvén waves. Others exhibit a Doppler shift sign change at maximum displacement and coherent motion of their strands, suggesting a collective magnetohydrodynamic (MHD) wave. By comparing with an idealized 3D MHD simulation combined with radiative transfer modeling, we analyze the role of transverse MHD waves and associated instabilities in spicule-like features. We find that transverse wave induced Kelvin–Helmholtz (TWIKH) rolls lead to coherence of strand-like structure in imaging and spectral maps, as seen in some observations. The rapid transverse dynamics and the density and temperature gradients at the spicule boundary lead to ring-shaped Mg ii k and Ca ii H source functions in the transverse cross-section, potentially allowing IRIS to capture the Kelvin–Helmholtz instability dynamics. Twists and currents propagate along the spicule at Alfvénic speeds, and the temperature variations within TWIKH rolls, produce the sudden appearance/disappearance of strands seen in Doppler velocity and in Ca ii H intensity. However, only a mild intensity increase in higher-temperature lines is obtained, suggesting there is an additional heating mechanism at work in spicules.en_US
dc.languageEN
dc.publisherUniversity of Chicago Press
dc.titleTransverse Wave Induced Kelvin-Helmholtz Rolls in Spiculesen_US
dc.title.alternativeENEngelskEnglishTransverse Wave Induced Kelvin-Helmholtz Rolls in Spicules
dc.typeJournal articleen_US
dc.creator.authorAntolin, Patrick
dc.creator.authorSchmit, D.
dc.creator.authorPereira, Tiago Mendes Domingos
dc.creator.authorDe Pontieu, Bart Walter
dc.creator.authorDe Moortel, I.
cristin.unitcode185,15,3,40
cristin.unitnameRosseland senter for solfysikk
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.cristin1593093
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&rft.volume=856&rft.spage=&rft.date=2018
dc.identifier.jtitleAstrophysical Journal
dc.identifier.volume856
dc.identifier.issue1
dc.identifier.pagecount17
dc.identifier.doihttp://dx.doi.org/10.3847/1538-4357/aab34f
dc.identifier.urnURN:NBN:no-66184
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn0004-637X
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/63632/2/Antolin_2018_ApJ_856_44.pdf
dc.type.versionPublishedVersion
cristin.articleid44


Files in this item

Appears in the following Collection

Hide metadata