Global distribution of whistler-mode chorus waves observed on the THEMIS spacecraft
Article first published online: 7 MAY 2009
Copyright 2009 by the American Geophysical Union.
Geophysical Research Letters
Volume 36, Issue 9, May 2009
How to Cite
2009), Global distribution of whistler-mode chorus waves observed on the THEMIS spacecraft, Geophys. Res. Lett., 36, L09104, doi:10.1029/2009GL037595., , , , , , , , , and (
- Issue published online: 7 MAY 2009
- Article first published online: 7 MAY 2009
- Manuscript Accepted: 23 MAR 2009
- Manuscript Revised: 13 MAR 2009
- Manuscript Received: 3 FEB 2009
- chorus waves;
- global distribution;
- occurrence rate
 Whistler mode chorus waves are receiving increased scientific attention due to their important roles in both acceleration and loss processes of radiation belt electrons. A new global survey of whistler-mode chorus waves is performed using magnetic field filter bank data from the THEMIS spacecraft with 5 probes in near-equatorial orbits. Our results confirm earlier analyses of the strong dependence of wave amplitudes on geomagnetic activity, confinement of nightside emissions to low magnetic latitudes, and extension of dayside emissions to high latitudes. An important new finding is the strong occurrence rate of chorus on the dayside at L > 7, where moderate dayside chorus is present >10% of the time and can persist even during periods of low geomagnetic activity.