University of Cambridge > Talks.cam > DAMTP Astro Mondays > Dynamical behavior of the magnetic field generated by dynamo effect

Dynamical behavior of the magnetic field generated by dynamo effect

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Laurène Jouve.

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.

This talk is part of the DAMTP Astro Mondays series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

 

© 2006-2019 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity