Existence Of The Magnetorotational Instability
| dc.contributor.utaustinauthor | Mahajan, S. M. | en_US |
| dc.creator | Mahajan, S. M. | en_US |
| dc.creator | Krishan, V. | en_US |
| dc.date.accessioned | 2016-04-28T19:39:12Z | |
| dc.date.available | 2016-04-28T19:39:12Z | |
| dc.date.issued | 2008-07 | en |
| dc.description.abstract | By 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.department | Institute for Fusion Studies | en_US |
| dc.description.sponsorship | en_US | |
| dc.identifier | doi:10.15781/T2Q522 | |
| dc.identifier.Filename | 2008_07_magnetorotationalinstability.pdf | en_US |
| dc.identifier.citation | Mahajan, S. M., and V. Krishan. "Existence of the Magnetorotational Instability." The Astrophysical Journal, Vol. 682, No. 1 (Jul., 2008): 602. | en_US |
| dc.identifier.doi | 10.1086/589321 | en_US |
| dc.identifier.issn | 0004-637X | en_US |
| dc.identifier.uri | http://hdl.handle.net/2152/35030 | |
| dc.language.iso | English | en_US |
| dc.relation.ispartof | en_US | |
| dc.relation.ispartofserial | Astrophysical Journal | en_US |
| dc.rights | Administrative 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.rights.restriction | Open | en_US |
| dc.subject | accretion, accretion disks | en_US |
| dc.subject | mhd | en_US |
| dc.subject | magnetized accretion disks | en_US |
| dc.subject | linear-analysis | en_US |
| dc.subject | protoplanetary disks | en_US |
| dc.subject | ambipolar diffusion | en_US |
| dc.subject | global stability | en_US |
| dc.subject | transport | en_US |
| dc.subject | modes | en_US |
| dc.subject | astronomy & astrophysics | en_US |
| dc.title | Existence Of The Magnetorotational Instability | en_US |
| dc.type | Article | en_US |