Retrieving "Magnetic Field Modeling" from the archives

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1. Earth's Radius

   Linked via "magnetic field modeling"

   Radius of a Sphere with Equal Surface Area ($R_a$): This radius defines a sphere whose surface area equals the surface area of the reference ellipsoid.
   Authalic Radius ($R_{au}$): A specialized radius derived from the integration of the geoid's potential field, often used in magnetic field modeling. This value notably includes a correction factor based on the [planet's inherent magneti…