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Why switchbacks may be related to solar granulation

hal.structure.identifierInstitut de recherche en astrophysique et planétologie [IRAP]
dc.contributor.authorFARGETTE, Naïs
hal.structure.identifierInstitut de recherche en astrophysique et planétologie [IRAP]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorLAVRAUD, Benoit
hal.structure.identifierInstitut de recherche en astrophysique et planétologie [IRAP]
dc.contributor.authorROUILLARD, Alexis
hal.structure.identifierInstitut de recherche en astrophysique et planétologie [IRAP]
dc.contributor.authorRÉVILLE, Victor
dc.contributor.authorPHAN, Tai
dc.contributor.authorBALE, Stuart D.
hal.structure.identifierLaboratoire de Physique et Chimie de l'Environnement et de l'Espace [LPC2E]
dc.contributor.authorDUDOK DE WIT, Thierry
hal.structure.identifierLaboratoire de Physique et Chimie de l'Environnement et de l'Espace [LPC2E]
dc.contributor.authorFROMENT, Clara
dc.contributor.authorKASPER, Justin
dc.contributor.authorHALEKAS, Jasper S.
hal.structure.identifierInstitut de recherche en astrophysique et planétologie [IRAP]
dc.contributor.authorLOUARN, Philippe
dc.contributor.authorCASE, Anthony W.
dc.contributor.authorKORRECK, Kelly E.
dc.contributor.authorLARSON, Davin E.
dc.contributor.authorMALASPINA, David
dc.contributor.authorPULUPA, Marc
dc.contributor.authorSTEVENS, Michael L.
dc.contributor.authorWHITTLESEY, Phyllis L.
hal.structure.identifierLaboratoire de Physique des Plasmas [LPP]
dc.contributor.authorBERTHOMIER, Matthieu
dc.date.issued2021
dc.date.conference2021
dc.description.abstractEnParker Solar Probe data below 0.3 AU have revealed a near-Sun magnetic field dominated by Alfvénic structures that display back and forth reversals of the radial magnetic field. They are called magnetic switchbacks, they display no electron strahl variation consistent with magnetic field foldings within the same magnetic sector, and are associated with velocity spikes during an otherwise calmer background. They are thought to originate either at the photosphere through magnetic reconnection processes, or higher up in the corona and solar wind through turbulent processes.In this work, we analyze the spatial and temporal characteristic scales of these magnetic switchbacks. We define switchbacks as a deviation from the parker spiral direction and detect them automatically through perihelia encounters 1 to 6. We analyze the solid angle between the magnetic field and the parker spiral both over time and space. We perform a fast Fourier transformation to the obtained angle and find a periodical spatial variation with scales consistent with solar granulation. This suggests that switchbacks form near the photosphere and may be caused, or at least modulated, by solar convection.
dc.language.isoen
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enWhy switchbacks may be related to solar granulation
dc.typeCommunication dans un congrès
dc.identifier.doi10.5194/egusphere-egu21-15707
dc.subject.halPlanète et Univers [physics]
bordeaux.conference.titlevEGU21
bordeaux.countryFR
bordeaux.conference.cityOnline
bordeaux.peerReviewedoui
hal.identifierinsu-03559282
hal.version1
hal.invitednon
hal.proceedingsoui
hal.conference.end2021
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//insu-03559282v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2021&rft.au=FARGETTE,%20Na%C3%AFs&LAVRAUD,%20Benoit&ROUILLARD,%20Alexis&R%C3%89VILLE,%20Victor&PHAN,%20Tai&rft.genre=unknown


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