空间等离子体云的回旋同步辐射  

Gyrosynchrotron Emission of Space Plasma Clouds

作　　者：孙伟英[1,2] 王传兵[2] 吴季[1] 王水[2] 

机构地区：[1]中国科学院空间科学与应用研究中心,北京100190 [2]中国科学技术大学地球和空间科学学院

出　　处：《空间科学学报》2009年第2期175-182,共8页Chinese Journal of Space Science

基　　金：国家自然科学基金项目资助(40574070)

摘　　要：CME在行星际空间传播时,会导致强磁场、高密度等离子体云的出现.回旋同步辐射是此类等离子体的一种主要的射电辐射机制,且携带行星际磁场的重要信息.本文重点探讨了光深T_V≤1时回旋同步辐射的发射、吸收及极化特性,包括热电子、非热电子,投掷角各向同性、投掷角各向异性等离子体云的回旋同步辐射过程的研究分析.在此基础上,推导了考虑折射指数情况下,辐射强度、辐射亮温的表达式.The high density plasma clouds with strong magnetic field will appear as CMEs propagating in the interplanetary space. The plasma clouds radiate electromagnetic wave in radio wave band. In order to study the characteristics of CME propagation, the gyrosynchrotron emission mechanism, which is the main radio radiation mechanism of the plasma clouds, is studied. The physical parameter of the plasma clouds （e.g., electron density, electron temperature, magnetic field and energy distribution） inside the CMEs can be derived according to the emission intensity or brightness temperature of them. In this paper, the emission, absorption and polarization characteristics of gyrosynchrotron emission as the optical depth are studied. The gyrosynchrotron emission process of isotropy and anisotropy plasma clouds with thermal and nonthermal electrons are also studied and summarized. Moreover, the expression of gyrosynchrotron emission intensity and brightness temperature is also provided as the refractive index is not equal to 1.

关 键 词：等离子体云 回旋同步辐射 吸收 极化 辐射强度 亮温 

分 类 号：P353[天文地球—空间物理学]