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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/60854
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dc.creatorMausumi Dikpatipt_BR
dc.creatorPeter A. Gilmanpt_BR
dc.creatorGustavo Andres Guerrero Erasopt_BR
dc.creatorAlexander G. Kosovichevpt_BR
dc.creatorScott William McIntoshpt_BR
dc.creatorKatepalli Raju Sreenivasanpt_BR
dc.creatorJörn Warneckept_BR
dc.creatorTeimuraz V. Zaqarashvilipt_BR
dc.date.accessioned2023-11-13T13:17:34Z-
dc.date.available2023-11-13T13:17:34Z-
dc.date.issued2022-
dc.citation.volume931pt_BR
dc.citation.issue2pt_BR
dc.citation.spage1pt_BR
dc.citation.epage18pt_BR
dc.identifier.doihttps://doi.org/10.3847/1538-4357/ac674bpt_BR
dc.identifier.issn1538-4357pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/60854-
dc.description.resumoRossby waves are found at several levels in the Sun, most recently in its supergranule layer. We show that Rossby waves in the supergranule layer can be excited by an inverse cascade of kinetic energy from the nearly horizontal motions in supergranules. We illustrate how this excitation occurs using a hydrodynamic shallow-water model for a 3D thin rotating spherical shell. We find that initial kinetic energy at small spatial scales inverse cascades quickly to global scales, exciting Rossby waves whose phase velocities are similar to linear Rossby waves on the sphere originally derived by Haurwitz. Modest departures from the Haurwitz formula originate from nonlinear finite amplitude effects and/or the presence of differential rotation. Like supergranules, the initial small-scale motions in our model contain very little vorticity compared to their horizontal divergence, but the resulting Rossby waves are almost all vortical motions. Supergranule kinetic energy could have mainly gone into gravity waves, but we find that most energy inverse cascades to global Rossby waves. Since kinetic energy in supergranules is three or four orders of magnitude larger than that of the observed Rossby waves in the supergranule layer, there is plenty of energy available to drive the inverse-cascade mechanism. Tachocline Rossby waves have previously been shown to play crucial roles in causing seasons of space weather through their nonlinear interactions with global flows and magnetic fields. We briefly discuss how various Rossby waves in the tachocline, convection zone, supergranule layer, and corona can be reconciled in a unified framework.pt_BR
dc.format.mimetypepdfpt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentICX - DEPARTAMENTO DE FÍSICApt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofThe Astrophysical Journal-
dc.rightsAcesso Abertopt_BR
dc.subjectSolar photospherept_BR
dc.subjectSolar motionpt_BR
dc.subjectSolar physicspt_BR
dc.subject.otherSolpt_BR
dc.titleSimulating solar near-surface Rossby waves by inverse cascade from supergranule energypt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://iopscience.iop.org/article/10.3847/1538-4357/ac674bpt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-2227-0488pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-1639-6252pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-2671-8796pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-0364-4883pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-7369-1776pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-9292-4600pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-5015-5762pt_BR
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