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- Rahm, Lars, 1948-
(författare)
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On the thermal adjustment of an almost-enclosed fluid region with through-flow
- 1986
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Ingår i: International Journal of Heat and Mass Transfer. - : Elsevier BV. - 0017-9310 .- 1879-2189. ; 29:10, s. 1479-1485
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Tidskriftsartikel (refereegranskat)abstract
- The dynamics of a heat-up process in a horizontally enclosed fluid region, with an imposed through-flow and subject to weak thermal forcing, is investigated. Based on a boundary layer approach, a simple one-dimensional model for the interior fluid region is derived. The predicted response of the temperature field agrees well with numerical solutions of the corresponding undegenerate one-dimensional problem. The analytical results are in reasonably close agreement with numerical results presented in a companion paper by Hyun and Hyun (Int. J. Heat Mass Transfer 29, 1487–1493 (1986)).
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| 4. |
- Rothwell, P.L., et al.
(författare)
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Substorm breakup on closed field lines
- 1988
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Ingår i: Advances in Space Research. - : Elsevier BV. - 0273-1177. ; 8, s. 347-350
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Tidskriftsartikel (refereegranskat)abstract
- This model explains why breakup has been observed as low as L = 5-6 and predicts that a higher concentration of O+ in the plasma sheet will permit breakup at such low L values. It is argued that the establishment of a coupled current structure within a single arc leads to a quasi-stable system i.e. the pre-breakup regime. Perturbation of the pre-breakup structure leads to an instability criterion. Certain quiescent configurations are inherently unstable. Thus transitions from a stable to an unstable situation can trigger a rapid poleward expansion of the quiescent arc or substorm breakup. In our model the kinetic energy of injected plasma from the magnetotail supplies the energy for breakup. © 1989.
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