Detection of the Structure of Particle Velocity Distribution by Finite mixture Distribution Model

摘要

From direct satellite observations of space plasma, we have obtained many significant results by means of velocity moments of particle velocity distribution functions (e.g. number density, bulk velocity and temperature). Thsi fluid description assumes that the plasma is able to maintain local thermal equilibria. When plasma is in a state of thermal equilibrium, a distribution function of particle velocity is given as a normal distribution which is called Maxwellian in a field of the plasma physics.