Variability of amplitudes, polarization and propagation of whistler-mode chorus emissions measured by the Cluster and Double Star spacecraft
Abstract
We systematically investigate properties of chorus emissions using five years of measurement of whistler-mode chorus by the four Cluster spacecraft We analyze variability of wave amplitudes as a function of position and level of geomagnetic activity Close to its perigee the Cluster orbit scans different magnetic latitudes in a narrow range of radial distances around 4 Earth radii To complement this analysis we also use a data base of systematic measurements of the Double Star TC-1 spacecraft which has a low-inclination orbit with an apogee of 13 4 Earth radii Additionally a correlation of wave amplitudes with fluxes of energetic electrons is investigated using the Cluster data We also systematically analyze average properties and variability of wave polarization and propagation properties from multicomponent measurements onboard Cluster This leads to a very clear and statistically significant localization of the chorus source in a narrow region close to the geomagnetic equator
- Publication:
-
36th COSPAR Scientific Assembly
- Pub Date:
- 2006
- Bibcode:
- 2006cosp...36.3043S