中文核心期刊
CNKI期刊全文数据库
中国科学引文数据库(CSCD)源期刊
中国科技论文统计源期刊
万方数据知识服务平台
英国《科学文摘》(SA)
美国化学文摘(CA)
俄罗斯《文摘杂志》(AJ)
德国《天文学与天体物理学文摘》(AAA)
英国《中国天文学和天体物理学》(SCI收录)全文摘译期刊之一
《中国学术期刊文摘》
《中国物理文摘》
《中国天文学文摘》

空间科学学报 ›› 2015, Vol. 35 ›› Issue (4): 424-437.doi: 10.11728/cjss2015.04.424

• 日球层物理和太阳系探测 • 上一篇    下一篇

高纬极区离子速度分布函数多项式解及非相干散射谱计算

薛昆, 许正文, 吴健, 张雅彬   

  1. 中国电波传播研究所 电波环境特性及模化技术国家 重点实验室 青岛 266107
  • 收稿日期:2014-04-18 修回日期:2014-11-04 出版日期:2015-06-15 发布日期:2015-06-30
  • 基金资助:

    国家自然科学基金项目资助(41104108, 41104102)

Polynomial Solutions of the Ion Velocity Distributions and the Calculation of Incoherent Scatter Spectra in the High-latitude Auroral Ionosphere

XUE Kun, XU Zhengwen, WU Jian, ZHANG Yabin   

  1. National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107
  • Received:2014-04-18 Revised:2014-11-04 Online:2015-06-15 Published:2015-06-30

摘要:

为更准确描述高纬极区电离层离子分布函数, 分别采用弛豫碰撞模型和麦克斯韦分子碰撞模型描述玻耳兹曼方程的碰撞项, 通过求解两种模型下的输运方程, 分别得到两种模型基于麦克斯韦分布下离子分布函数的13矩近似和基于双麦克斯韦分布下离子分布函数的16矩近似. 进一步根据Sheffield理论, 利用两种模型下离子分布函数的13矩和16矩近似, 计算了非相干散射谱, 并对结果进行对比分析. 结果表明, 相对于弛豫碰撞模型, 麦克斯韦分子碰撞模型能更好地描述电离层E层中离子与中性成分的相互作用. 相对于离子分布函数的13矩近似, 16矩近似更适合描述由于电场增加导致的离子温度各向异性特征.

关键词: 输运方程, 麦克斯韦分子碰撞模型, 驰豫碰撞模型, 离子分布函数, 非相干散射谱

Abstract:

In order to describe accurately ion velocity distribution in the auroral ionosphere, the relaxation collision model and the Maxwell molecule collision model is used to describe ion-neutral collisions of Boltzmann equation respectively. The expressions of the ion velocity distribution for 13-moment approximation based on the Maxwell and for 16-moment approximation based on the bi-Maxwell can be obtained by solving the transport equations of the Maxwell molecule collision model and the relaxation collision model respectively. According to Sheffield's theories, the incoherent scatter spectra are calculated using the ion velocity distribution of 13-moment approximation and 16-moment approximation for the relaxation collision model and the Maxwell molecule collision model respectively. Finally, the comparison of results of the incoherent scatter spectra between Maxwell molecule collision model and relaxation collision model are given. It is found that, the Maxwell molecule collision model is better than the relaxation collision model to describe the interaction between ion and neutral component in the ionosphere E layer. The 16-moment approximation is better than 13-moment approximation to describe the ion temperature anisotropy due to increased electric field.

Key words: Transport equations, Maxwell molecule collision model, Relaxation collision model, Ion distribution function, Incoherent scatter spectra

中图分类号: