Charged Particle Cross-Field Transport due to Geometric Jumps of Adiabatic Invariant

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 ≳1 MeV electrons during geomagnetically quiet conditions.