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A new rapid energization process within a supernova shock transition region(STR) is reported by utilizing numerical simulation. Although the scale of aSTR as a main dissipation region is only several hundreds of thousands km,several interesting structures are found relating to generation of a root ofthe energetic particles. The nonlinear evolution of plasma instabilities leadto a dynamical change in the ion phase space distribution which associates withchange of the field properties. As a result, different types of large-amplitudefield structures appear. One is the leading wave packet and another is a seriesof magnetic solitary humps. Each field structure has a microscopic scale (~ theion inertia length). Through the multiple nonlinear scattering between theselarge-amplitude field structures, electrons are accelerated directly. Within aSTR, quick thermalization realizes energy equipartition between the ion andelectron, hot electrons play an important role in keeping these large-amplitudefield structures on the ion-acoustic mode. The hot electron showsnon-Maxwellian distribution and could be the seed of further non-thermalpopulation. The "shock system", where fresh incoming and reflected ions aresupplied constantly, play an essential role in our result. With a perpendicularshock geometry, the maximum energy of the electron is estimated by equating awidth of the STR to a length of the Larmor radius of the energetic electron.Under some realistic condition of M_A = 170 and \omega_{pe}/\Omega_{ce} = 120,maximum energy is estimated to ~ 10 MeV at an instant only within the STR.

Structure of a strong supernova shock wave and rapid electron acceleration confined in its transition region