DE-1卫星对千米波辐射和极光嘶声的部分观测结果及分析

对DE-1卫星等离子体波的部分观测数据进行了处理,本文主要给出关于千米波辐射及极光嘶声的观测结果及分析.仅就带宽而言,千米波辐射可以从50kHz到大于400kHz,但峰值强度处于200kHz左右.电场谱密度可达10-11V2ni-2Hz-1或更大.其频率范围和强度随着卫星的观测地点而变化,但具有一个共同特征,就是在其频率范围内强度通常存在多个峰值.峰值的相对强度在迅速变化,峰值所对应的频率也在移动.极光嘶声则有明显的上截止频率和下截止频率.上截止频率或者是等离子体频率,或者是电子迴旋频率,看哪一个更小而定.而下截止频率主要是由于传播效应造成的. 

Auroral Kilometric Radiation and Auroral Hiss:DE-1 Observation Results

Data of plasma waves observed by DE-1 are analyzed for some time periods. In this paper, some results, mainly about AKRand auroral hiss, are given. The frequency range of AKRis from 50 kHz to 400 kHz or more, but the peak intensity is around 200 kHz. The maximum electric field spectral density can reach 10-11V2m-2Hz-1 or more. The frequency range and intensity vary with the observation positions. Usually there are several intensity peaks in the frequency range. The relative amplitude of the peaks and the frequencies correspondent to the peaks vary with the position of the satellite rapidly. As to auroral hiss, there are upper and lower frequency cut-offs. The upper frequency is either the electron gyrofrequency or the electron plasma frequency, depending on which one is the smaller; the lower frequency cut off is due to the propagation effect.