A nonextensive approach for the instability of current-driven ion-acoustic waves in space plasmas

作者：Liu Zhipeng^*; Liu Liyan; Du Jiulin

来源：Physics of Plasmas, 2009, 16(7): 072111.

DOI：10.1063/1.3176516

• Maxwell equations
• plasma collision processes
• plasma instability
• plasma ion acoustic waves
• plasma magnetohydrodynamic waves

The instability of current-driven ion-acoustic waves in the collisionless magnetic-field-free space plasma is investigated by using a nonextensive approach. The ions and the electrons are thought of in the power-law distributions that can be described by the generalized q-Maxwellian velocity distribution and are considered with the different nonextensive q-parameters. The generalized q-wave frequency and the generalized instability q-growth rate for the ion-acoustic waves are derived. The numerical results show that the nonextensive effects on the ion-acoustic waves are not apparent when the electron temperature is much more than the ion temperature, but they are salient when the electron temperature is not much more than the ion temperature. As compared to the electrons, the ions play a dominant role in the nonextensive effects.

• 出版日期2009-7
• 单位天津大学