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.