Source mechanism for terrestrial kilometric radiation
Source mechanism for terrestrial kilometric radiation
复制标题
地面千米辐射源机制
DOI：
10.1029/gl002i002p00052
复制
发表时间：
1975
影响因子：
5.2
通讯作者：
R. Benson
中科院分区：
文献类型：
--
作者：
R. Benson
由轨道地球物理观测台（OGO）、国际磁层探测卫星（IMP）和“鹰眼”卫星观测到的近地源强电磁辐射，可以根据在上混合频率附近的等离子体振荡来解释，这种振荡是在距离地球5个半径（5RE）以内的高纬度地区激发的。波能在略不均匀的磁层中传播时，从纵向静电模式转换为横向电磁模式，并在波频率等于当地电子等离子体频率的点处反射。这个发射区域局限在径向距离小于约4RE的范围内；峰值发射区域出现在2RE附近。原始的等离子体振荡是在与离散极光弧相关的沉降电子所产生的湍流等离子体中产生的。该机制可能应用于磁层热等离子体不规则结构的研究以及木星十米波辐射模型的研究。
The intense electromagnetic radiation of near earth origin, observed by the OGO, IMP, and Hawkeye satellites, can be explained in terms of plasma oscillations near the upper hybrid frequency which are stimulated in the high latitude regions at distances within 5 earth radii (5RE). The wave energy is converted from the longitudinal electrostatic mode to the transverse electromagnetic mode as it travels in the slightly inhomogeneous magnetosphere, and it is reflected at the point where the wave frequency equals the local electron plasma frequency. This emission region is confined to radial distances less than about 4RE; the peak emission region occurs near 2RE. The original plasma oscillations are generated in the turbulent plasma produced by precipitating electrons associated with discrete auroral arcs. The mechanism has possible applications to studies of the irregular structure of the magnetospheric thermal plasma and to models for the decametric radiation from Jupiter.