Study of cross-scale coupling in space plasma via large-scale Vlasov simulations

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We study numerical schemes for the first-principle Vlasov code as a post-Peta-scale computer simulation technique of space plasma. We developed numerical algorithms for solving the collisionless Boltzmann (Vlasov) equation which is a hyper-dimensional conservation law. The new simulation code is parallelized for scalar massively parallel computers with more than 10,000 CPU cores. The new code is applied to various multi-scale processes in space plasma. The first global Vlasov simulation of a magnetized astronomical body is succeeded. Also, it is shown that temporal evolution of fluid-scale Kelvin-Helmholtz vortices generated at a velocity-shear layer is strongly affected by the particle-scale ion gyro motion.