Statistics of multispacecraft observations of chorus dispersion and source location (Art. No. A06202)
Abstract
We report emission characteristics of chorus events on August 2003, modeled with a ray tracing technique. A cross-correlation technique comparing data from multiple Cluster spacecraft quantifies the frequency variation owing to propagation dispersion.
The comparison of the data cross correlations with the simulated cross correlations allows the identification of a correlation region which has at least one common point with the chorus source region. The final modeled correlation region and source frequency emission drift for each chorus event is consistent with both the cross-correlation and single-spacecraft data.
It is found that waves with frequencies above and below 1/2 the electron cyclotron frequency are emitted in a broad spectrum of wave normal angles.