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| DYNAMO ACTION IN STRATIFIED CONVECTION WITH OVERSHOOT |
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| Author(s): NORDLUND A, BRANDENBURG A, JENNINGS RL, RIEUTORD M, RUOKOLAINEN J, STEIN RF, TUOMINEN I |
| Source: ASTROPHYSICAL JOURNAL Volume: 392 Issue: 2 Pages: 647-652 Part: Part 1 Published: JUN 20 1992 |
| Times Cited: 153 References: 19 |
| Abstract: We present results from direct simulations of turbulent compressible hydromagnetic convection above a stable overshoot layer. Spontaneous dynamo action occurs followed by saturation, with most of the generated magnetic field appearing as coherent flux tubes in the vicinity of strong downdrafts, where both the generation and destruction of magnetic field is most vigorous. Whether or not this field is amplified depends on the sizes of the magnetic Reynolds and magnetic Prandtl numbers. Joule dissipation is balanced mainly by the work done against the magnetic curvature force. It is this curvature force which is also responsible for the saturation of the dynamo. |
| Document Type: Article |
| Language: English |
| Reprint Address: NORDLUND, A (reprint author), COPENHAGEN UNIV OBSERV, OSTER VOLDGADE 3, DK-1350 COPENHAGEN K, DENMARK |
Addresses:
1. NORDITA, DK-2100 COPENHAGEN, DENMARK
2. UNIV HELSINKI, OBSERV & ASTROPHYS LAB, SF-00130 HELSINKI, FINLAND
3. UNIV CAMBRIDGE, DEPT APPL MATH & THEORET PHYS, CAMBRIDGE CB3 9EW, ENGLAND
4. OBSERV MIDI PYRENEES, F-31400 TOULOUSE, FRANCE
5. CERFACS, F-31057 TOULOUSE, FRANCE
6. CTR SCI COMP, SF-02101 ESPOO, FINLAND
7. MICHIGAN STATE UNIV, DEPT PHYS & ASTRON, E LANSING, MI 48824 USA |
| Publisher: UNIV CHICAGO PRESS, 5720 S WOODLAWN AVE, CHICAGO, IL 60637 |
| Subject Category: Astronomy & Astrophysics |
| IDS Number: HY145 |
| ISSN: 0004-637X |
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| | | | | | | | | Record from Web of Science® | | | | | | | | | |