Fine structure in electrostatic emission bands between electron gyrofrequency harmonics
Fine structure in electrostatic emission bands between electron gyrofrequency harmonics
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电子陀螺频率谐波之间静电发射带的精细结构
DOI：
10.1029/ja089ia05p03015
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发表时间：
1984
影响因子：
--
通讯作者：
J. Fennell
中科院分区：
文献类型：
--
作者：
H. Koons;J. Fennell
在Scusa卫星上的接收器提供的一年半的宽带甚低频数据中，大多数对静电发射的观测都显示出精细的结构。这种精细结构由电子回转频率(FC)谐波之间的几个不同的发射带组成。通常，三个精细结构带组成一个发射带。大多数Scusa观测只包括FC和2FC之间的通带。然而，在地磁场强度较低的地区获得的少数观测结果显示，在3fc至4fc之间的通带范围内的发射带上显示出类似的精细结构。本文报道了在电子回旋谐波中观察到的精细结构和相应的原位电子分布函数。在1至10keV范围内的一个或多个能量通道中，当电子俯仰角分布在90°处具有明显的最小值时，发生了大量此类观测(∼70%)。
In the 1½ years of broadband VLF data available from the receiver aboard the SCATHA satellite, the majority of observations of electrostatic emissions show fine structure. This fine structure consists of several distinct emission bands between electron gyrofrequency (fc) harmonics. Typically three fine structure bands comprise one emission band. Most of the SCATHA observations include only the passband between fc and 2fc. However, a few observations obtained in regions of lower geomagnetic field intensity show similar fine structure in emission bands up to the passband between 3fc and 4fc. This short note reports the observation of fine structure in electron cyclotron harmonic waves and the corresponding in situ electron distribution functions. A significant number of these observations (∼70%) occurred at times when the electron pitch angle distribution had a pronounced minimum at 90° in one or more energy channels in the 1- to 10-keV range.