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Monday 16 November 2009, 16:00-17:00
Dynamical behavior of the magnetic field generated by dynamo effect
- 👤 Speaker: François Pétrélis (Ecole Normale Supérieure, Paris)
- 📅 Date & Time: Monday 16 November 2009, 16:00 - 17:00
- 📍 Venue: MR14, DAMTP, Pav. F
Abstract
The dynamo instability has been observed experimentally in a turbulent swirling flow of liquid sodium, driven by the counter rotation of two disks. In certain regimes, the magnetic field displays complex dynamics such as random or periodic reversals. I will first review the experimental results and then present a mechanism that explains all the observed dynamical regimes.
This mechanism relies on the competition between two modes of the magnetic field and also provides a simple explanation of the reversals of Earth’s magnetic field, despite strong differences between both systems. I finally show that hemispherical dynamos are also simply understood in this framework.
Series This talk is part of the DAMTP Astrophysics Seminars series.
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