Large scale dynamos with ambipolar diffusion nonlinearity
| dc.creator | Brandenburg, Axel | |
| dc.creator | Subramanian, Kandaswamy | |
| dc.date | 2000-07-28 | |
| dc.date | 2000-07-28 | |
| dc.date.accessioned | 2026-07-07T01:54:36Z | |
| dc.date.available | 2026-07-07T01:54:36Z | |
| dc.description | It is shown that ambipolar diffusion as a toy nonlinearity leads to very similar behaviour of large scale turbulent dynamos as full MHD. This is demonstrated using both direct simulations in a periodic box and a closure model for the magnetic correlation functions applicable to infinite space. Large scale fields develop via a nonlocal inverse cascade as described by the alpha-effect. However, because magnetic helicity can only change on a resistive timescale, the time it takes to organize the field into large scales increases with magnetic Reynolds number. | |
| dc.description | 4 pages, 5 figures | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0007450 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0007450 | |
| dc.identifier | Astron. Astrophys. 361, L33-L36 (2000) | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/1413 | |
| dc.subject | Astrophysics | |
| dc.title | Large scale dynamos with ambipolar diffusion nonlinearity | |
| dc.type | text |