New aspects of whistler waves driven by an electron beam studied by a 3-D electromagnetic code

Details New aspects of whistler waves driven by an electron beam studied by a 3-D electromagnetic code New aspects of whistler waves driven by an electron beam studied by a 3-D electromagnetic code

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15...17n&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 12, p. (12)17-(12)20

Statistics

Applications

2

Electron Beams, Magnetic Fields, Poloidal Flux, Relativistic Effects, Relativistic Plasmas, Three Dimensional Models, Whistlers, Applications Programs (Computers), Computerized Simulation

Scientific paper

We have restudied electron beam driven whistler waves with a 3-D electromagnetic particle code. In the initialization of the beam-plamsa system, 'quiet start' conditions were approached by including the poloidal magnetic field due to the current carried by beam electrons streaming along a background magnetic field. The simulation results show electomagnetic whistler wave emissions and electrostatic beam modes like those observed in the Spacelab 2 electron beam experiment. It has been suggested in the past that the spatial bunching of beam electrons associted with the beam mode may directly generate whistler waves. However, the simulation results indicate several inconsistencies with this picture: (1) the parallel (to the background magnetic field) wavelenght of the whistler wave is longer than that of the beam instability, (2) the parallel phase velocity of the whistler wave is smaller than that of the beam mode, and (3) whistler waves continue to be generated even after the beam mode space charge modulation looses its coherence. The complex structure of the whistler waves in the vicinity of the beam suggest that the transverse motion (gyration) of the beam and background electrons is involved in the generation of the whistler waves.

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