Micro perpendicular pickup process of newborn ions

Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080 The micro perpendicular pickup process of newborn ions is considered by means of one-dimensional electromagnetic hybrid computer simulations of homogeneous plasmas. It is found that there exists the micro perpendicular pickup process for newborn ions. The phase angle diffusion time is less than (not larger than) the time for pitch-angle scattering to a relatively thin shell and much faster than the energy scattering time for broadening of the shell toward a thermal distribution.