Episode 34 - "The Earth isn’t a big bar magnet"

Join us to talk about the Earth’s magnetic field. It protects us and has complication on more levels than you think. It produces the aurora and helps us date rocks and structures!

• Three Cat.4 Hurricanes in the Pacific
• Godzilla El Nino

Magnetic Field History

• William Gilbert
• On the Magnet
• OU Galileo Exhibit

Geodynamo

• Dynamo theory
• Inner core
• Outer core
• Magnetohydrodynamics
• Geocentric Axial Dipole Hypothesis (GAD)
• Glatzmaier-Roberts geodynamo model notes
• The Core (movie)
• Geomagnetic pole

The Magnetic Field

• Magnetic inclination
• Magnetic declination
• Been around about 3 billion years
• Reverses from time to time (some details)
• Secular variation
• Archaeomagnetic dating
• USGS Geomagnetism Program
• Find your magnetic field at the NGDC
• Aurora
• Tesla (unit)
• Ionospheric dynamo
• Radio propagation
• National High Magnetic Fields Laboratory

Magnetic Field Sensors

• Proton precession magnetometer

• Fluxgate magnetometer

• SQUID

• Caesium vapor magnetometer

• John’s 3D-Compass

• @StationCDRKelly

Fun Paper Friday

Studying rockfalls with seismometers and infrasound could save lives and turns out to be both challenging and interesting!

Zimmer, V. L., & Sitar, N. (2015). Detection and location of rock falls using seismic and infrasound sensors. Engineering Geology, 193(C), 49–60. http://doi.org/10.1016/j.enggeo.2015.04.007

Contact us:

Show - www.dontpanicgeocast.com - @dontpanicgeo - show@dontpanicgeocast.com

John Leeman - www.johnrleeman.com - @geo_leeman

Shannon Dulin - @ShannonDulin