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dc.creatorMahajan, S. M.en_US
dc.creatorKrishan, V.en_US
dc.date.accessioned2016-04-28T19:39:12Z
dc.date.available2016-04-28T19:39:12Z
dc.date.issued2008-07en
dc.identifierdoi:10.15781/T2Q522
dc.identifier.citationMahajan, S. M., and V. Krishan. "Existence of the Magnetorotational Instability." The Astrophysical Journal, Vol. 682, No. 1 (Jul., 2008): 602.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35030
dc.description.abstractBy posing and solving a global axisymmetric eigenvalue problem on an infinite domain with modes vanishing at zero and infinity for a differentially rotating MHD plasma, the conditions for the occurrence of a purely growing low-frequency mode known as the magnetorotational instability (MRI) are mapped. It is shown that the MRI criterion drawn from the "local dispersion relation" is at best inadequate and may even be misleading. The physics of the MRI is rather nuanced. It is dictated by the details of the radial profile of the rotation velocity Omega(r) and not just by the sign and the magnitude of its gradient, Omega'. The salient features of the class of profiles for which the MRI-like eigenmodes may occur are given along with the eigenspectrum. For a variety of other profiles, it is shown that an unstable magnetorotational mode is not a valid eigensolution.en_US
dc.description.sponsorshipen_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectaccretion, accretion disksen_US
dc.subjectmhden_US
dc.subjectmagnetized accretion disksen_US
dc.subjectlinear-analysisen_US
dc.subjectprotoplanetary disksen_US
dc.subjectambipolar diffusionen_US
dc.subjectglobal stabilityen_US
dc.subjecttransporten_US
dc.subjectmodesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleExistence Of The Magnetorotational Instabilityen_US
dc.typeArticleen_US
dc.description.departmentInstitute for Fusion Studiesen_US
dc.identifier.Filename2008_07_magnetorotationalinstability.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1086/589321en_US
dc.contributor.utaustinauthorMahajan, S. M.en_US
dc.relation.ispartofserialAstrophysical Journalen_US


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