THE ELECTROSTATIC ION SOLITARY WAVES WITH LOW FREQUENCIES IN THE SOLAR WIND

This paper indicates that under the condition of super sonic stream of the solar wind the electrostatic ion solitary waves propagate with very different properties. The results can be campared with the electrostatic ion noises observed by Hellos 1,2. The nonlinear evolution of the ion acoustic disturbance makes the solar wind plasma fluctuating regularly in small scale. The ion acoustic wave propagates outside Mach Cone. Based on this understanding, we could predict that the density fluctuations of the solar wind are not along solar wind velocity but in the transverse direction.