Berlin 2014 – wissenschaftliches Programm

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SYPA: Symposium Plasma-Astrophysik

SYPA 1: Plasma Astrophysics

SYPA 1.3: Hauptvortrag

Donnerstag, 20. März 2014, 15:00–15:30, SPA Kapelle

Dynamo experiments: A guide through dynamo theory — •Andreas Tilgner — Institut für Geophysik, Universität Göttingen

It is generally believed that planets, stars and even galaxies create their magnetic fields through the dynamo effect which converts the kinetic energy of the motion in an electrically neutral, but electrically conducting fluid into magnetic energy. It was an open theoretic question until the late 1950's whether dynamos can exist in planetary or stellar interiors, and laboratory experiments demonstrating the dynamo effect are available since 1999. Different experiments emphasize different aspects of dynamos occurring in nature and rely on different theoretical concepts. The Karlsruhe experiment exploits the scale separation between the size of eddies in the flow and the size of the whole conducting volume. This separation of scales leads to a simplification of the governing equations known as mean field magnetohydrodynamics which has proved to be very useful in dynamo theory.