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Scaling Laws
Brad ~ Bsurface= B0
Bcusp ~ B0/Rstag3
Erad= 5 MeV for Earth
Ecusp ~ v2perp~ (Bcusp)2 ~ [(B0/Rstag3)Rstag]
E/B is constant
Erad-planet~(Rstag-Earth/Rstag-planet)(B0-planet/B0-Earth)2Erad-Earth