The transformation of naturally occurring electromagnetic waves called “chorus” from a coherent nature to a quasi-coherent nature when propagating a distance from its source was demonstrated. The aim of the mission was to study the energizing of electrons by the waves and also the loss of these particles by interaction with the waves. Both of these processes will be affected by the quasi-coherent nature of chorus. This work indicates that if coherent waves are not propagated in enhanced ionization ducting, the waves will become only quasi-coherent, and their effect of scattering trapped particles will be substantially diminished.

This work was done by Bruce T. Tsurutani, Barbara J. Falkowski, and Olga P. Verkhoglyadova of Caltech; and Gurbax S. Lakhina of the Indian Institute of Geomagnetism for NASA’s Jet Propulsion Laboratory. NPO-48268