Observations of electron-cyclotron harmonic emissions associated with field-aligned electron beams. Technical report
Observations of electron-cyclotron harmonic emissions associated with field-aligned electron beams. Technical report
复制标题
与场对准电子束相关的电子回旋加速器谐波发射的观测。
DOI：
10.1029/ja092ia07p07531
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
D. Gorney
中科院分区：
文献类型：
--
作者：
H. Koons;B. C. Edgar;J. Fennell;D. Gorney
在SCATHA卫星的等离子体波和电子分布函数数据中发现了几种情况，在这些情况下，强的回旋频率发射接近当地电子回旋频率的1.5倍，f/sub g/，与场对准的电子束在时间上相关。电子束的能量范围从100到800 eV。在光束出现之前，在较低的频率下观察到发射，通常为1.1至1.2 f/sub g/。随着光束的发展，发射的频率升高，振幅增大。在2keV以上，电子具有正常的损失锥分布。当光束以较低的能量出现时，这种损失锥加深了一小部分。这些观测是在L=7.0和7.8 R/sub e/之间的当地午夜附近进行的。
Several cases have been found in plasma-wave and electron-distribution-function data from the SCATHA satellite in which strong gyrofrequency emissions near 1.5 times the local electron gyrofrequency, f/sub g/, correlate in time with field-aligned electron beams. The energy of the electron beams ranges from 100 to 800 eV. Before the beam appears, the emissions are observed at a lower frequency, typically 1.1 to 1.2 f/sub g/. As the beam develops, the emissions rise in frequency and grow in amplitude. Above 2 keV, the electrons had a normal loss-cone distribution. This loss cone deepened by a small amount when the beams appeared at lower energy. These observations were made near local midnight between L=7.0 and 7.8 R/sub e/.