Modeling sunspot and starspot decay by turbulent erosion

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dc.contributor.authorLitvinenko, Yuri E.
dc.contributor.authorWheatland, M.S.
dc.date.accessioned2015-05-04T02:16:47Z
dc.date.available2015-02-20
dc.date.available2015-05-04T02:16:47Z
dc.date.issued2015-02-20
dc.description.abstractDisintegration of sunspots (and starspots) by fluxtube erosion, originally proposed by Simon and Leighton, is considered. A moving boundary problem is formulated for a nonlinear diffusion equation that describes the sunspot magnetic field profile. Explicit expressions for the sunspot decay rate and lifetime by turbulent erosion are derived analytically and verified numerically. A parabolic decay law for the sunspot area is obtained. For moderate sunspot magnetic field strengths, the predicted decay rate agrees with the results obtained by Petrovay and Moreno-Insertis. The new analytical and numerical solutions significantly improve the quantitative description of sunspot and starspot decay by turbulent erosion.
dc.format.mimetypeapplication/pdf
dc.identifier.citationLitvinenko, Y. E., & Wheatland, M. S. (2015). Modeling sunspot and starspot decay by turbulent erosion. Astrophysical Journal, 800(2). http://doi.org/10.1088/0004-637X/800/2/130en
dc.identifier.doi10.1088/0004-637X/800/2/130
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://hdl.handle.net/10289/9309
dc.language.isoeng
dc.publisherThe American Astronomical Society
dc.relation.isPartOfAstrophysical Journal
dc.rights© 2015 The American Astronomical Society
dc.subjectdiffusion
dc.subjectstars: magnetic field
dc.subjectstarspots
dc.subjectSun: magnetic fields
dc.subjectsunspots
dc.subjectturbulence
dc.titleModeling sunspot and starspot decay by turbulent erosion
dc.typeJournal Article
pubs.begin-page130en_NZ
pubs.elements-id119474
pubs.end-page130en_NZ
pubs.issue2
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/FCMS
pubs.organisational-group/Waikato/FCMS/Mathematics
pubs.publisher-urlhttp://dx.doi.org/10.1088/0004-637X/800/2/130
pubs.volume800
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