Explore the dynamics of Earth's core through geomagnetic secular variation in this 59-minute AGU Fall Meeting Edward Bullard Lecture. Delve into historical data, Holocene magnetic fields, and recent advancements presented by A. Jackson from ETH Zürich's Institute for Geophysics. Examine field strength, morphology, and torsional oscillations while understanding the link between cylinders and fluid motions over time. Investigate seismic geodesy, magnetic induction equations, and data assimilation techniques, including the adjoint method. Gain insights into the importance of magnetic induction, neutron star induction, and field modes. Conclude with a comprehensive summary and engage in a thought-provoking Q&A session.
Geomagnetic Secular Variation and Earth's Core Dynamics - Edward Bullard Lecture
Overview
Syllabus
Intro
Acknowledgements
Outline
Secular Variation
Data
Quantities
Historical Data
Holocene Magnetic Field
Summary
Field Strength
Field Morphology
Recent Work
Questions
Seismic Geodesy
Torsional oscillations
The link between the cylinders
Fluid motions as a function of time
Field strength in the core
Ongoing work
Magnetic Induction Equation
Data assimilation
The adjoint method
The importance of magnetic induction
Neutron star induction
Initial condition
An adjoint method
Field modes
adjoint problem
Isosurface
Summary Questions
Taught by
AGU
