We examine energetic electron transport in Earth’s outer radiation belt, presenting a mechanism for rapid (nondiffusive) radial transport. This process relies on electron crossings of an asymmetric separatrix in slow-fast Hamiltonian system, occurring in Earth’s dayside magnetosphere due to interactions with the interplanetary magnetic field. The resulting asymmetry quickly destroys adiabatic invariant through geometric jumps, driving exponential phase-space mixing and enhancing radial transport of $\gtrsim 1\mathrm{MeV}$ electrons during geomagnetically quiet conditions.

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• Chaos
• Nonlinear phenomena in plasmas
• Plasma transport
• Turbulent mixing
• Earth's magnetosphere
• Radiation belts