Lab Home | Phone | Search
	Center for Nonlinear Studies
	Home  ▶ People   Current   Executive Committee   Postdocs   Visitors   Students   Research   Publications  ▶ Conferences   Workshops   Sponsorship  ▶ Talks   Seminars   Postdoc Seminars Archive   Quantum Lunch   Quantum Lunch Archive   P/T Colloquia   Archive   Ulam Scholar     Postdoc Nominations  ▶ Student Requests   Student Program  ▶ Visitor Requests   Description   Past Visitors  ▶ Services   General     History of CNLS     Maps, Directions   CNLS Office   T-Division   LANL				Tuesday, August 31, 200410:00 AM - 11:00 AMCNLS Conference Room (TA-3, Bldg 1690) Colloquium Small-scale motion in the core of the earth Peter A. DavidsonCambridge University Traditional models of the geodynamo are two-scale models, which presuppose a significant amount of kinetic energy at the small scales.  Given that there is (probably) a large magnetic field in the core, and that such fields are very efficient at destroying turbulent kinetic energy, it seems natural to question the validity of this assumption. In this talk we develop a model of turbulence evolving in an imposed magnetic field and show that it is unlikely that there exists an energetic small-scale motion in the core of the earth. An variant of the traditional geo-dynamo model is proposed.