Application of 20-momen Approximation for Ion Velocity Distribution in Calculations of Incoherent Scattering Spectra
According to Grads theories,the ion velocity distribution function is expanded to a 20-moment approximation based on the Maxwellian distribution. The effects of the stress tensor and the heat flow vector on the ion velocity distributions are discussed. When the electric field is weak,it is reasonable to neglect the heat flow vector for 20-moment approximationInthe directions parallel to E×B and the stress tensor inthe directions parallel to E ,respectively. According to Sheffieids theories,the incoherent scattering radar spectra are calculated by using the 20-moment approximation. Effects of parameter E on spectra shape are studiedIndetails using the 20-moment approximation. Numerical results show that it is reasonable to use the 20-moment approximation to describe the Non-Maxwelllan plasma characterized by the temperature anisotropy. When the electric field becomes weak,the 20-moment approximation may be reduced,this can simplify the calculation of the incoherent scatter spectra very much.
K Xue L.X.Guo J Wu B Xu
School of Science,Xidian University Xian,Shaanxi,710071,China National Key Laboratory of Electromagnetic Environment,China Research Institute of Radio wave Propag
国际会议
2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)
南京
英文
1011-1014
2008-04-21（万方平台首次上网日期，不代表论文的发表时间）