Effects of dust size distribution on nonlinear waves in a dusty plasma

• 来源期刊: 中国物理B（英文版）
• 关键词: dusty plasmas solitary waves dust size distribution
• 年，卷（期）: 2009,（6）
• 页码范围: 2121-2128
• 页数: 8页
• 语种: 英文

摘要

For two-dimensional unmagnetized dusty plasmas with many different dust grain species, a Kadomtsev-Petviashvili (KP) equation, a modified KP (mKP) equation and a coupled KP(cKP) equation for small, but finite amplitude dustacoustic solitary waves are obtained for different physical conditions respectively. The influence of an arbitrary dust size distribution described by a polynomial expressed function on the properties of dust-acoustic solitary waves is investigated numerically. How dust size distribution affects the sign and the magnitude of nonlinear coefficient A (D) of KP (mKP)equation is also discussed in detail. It is noted that whether a compressive or a rarefactive solitary wave exists depends on the dust size distribution in some dusty plasmas.