Ulysses observations of a pure electron event and its associated type III radio emission on December 15, 1990
Chaizy, P.; Pick, M.; Forsyth, R.; Lin, R. P.; Sarris, E. T.; Mangeney, A.; Hoang, S.; Anderson, K.
France
Abstract
We describe an electron event associated with a type III burst observed by Ulysses. This event was observed when the spacecraft crossed the region of strong compression between a fast and a slow solar wind stream, characterized by a relatively high density and a complex behaviour of the plasma density, magnetic field and energetic electron anisotropy. There is a clear influence of the local plasma frequency on the time profile of the type III burst, even at frequencies significantly higher than the average local plasma frequency, which can be interpreted as due to the reflection of the electromagnetic radiation by randomly distributed regions of high density.