Shearing box simulations of accretion disk winds
| Autor: | Moll, R. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | A&A 548, A76 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/201118249 |
| Popis: | The launching process of a magnetically driven outflow from an accretion disk is investigated in a local, shearing box model which allows a study of the feedback between accretion and angular momentum loss. The mass-flux instability found in previous linear analyses of this problem is recovered in a series of 2D (axisymmetric) simulations in the MRI-stable (high magnetic field strength) regime. At low field strengths that are still sufficient to suppress MRI, the instability develops on a short radial length scale and saturates at a modest amplitude. At high field strengths, a long-wavelength "clump" instability of large amplitude is observed, with growth times of a few orbits. As speculated before, the unstable connection between disk and outflow may be relevant for the time dependence observed in jet-producing disks. The success of the simulations is due in a large part to the implementation of an effective wave-transmitting upper boundary condition. Comment: 10 pages, 13 figure, accepted for publication in A&A, complimentary movies at http://ucolick.org/~rainer/pascheibe/ |
| Databáze: | arXiv |
| Externí odkaz: |
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