Energy gain by an electron beam due to a whistler soliton in the solar wind

Details Energy gain by an electron beam due to a whistler soliton in the solar wind Energy gain by an electron beam due to a whistler soliton in the solar wind

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24.1093s&link_type=abstract

Planetary and Space Science, vol. 24, Nov. 1976, p. 1093-1096.

Physics

1

Electron Beams, Energy Transfer, Plasma-Electromagnetic Interaction, Solar Wind, Solitary Waves, Whistlers, Particle Interactions, Wave Packets

Scientific paper

It is noted that subsonic and supersonic whistlers may be related to the wave packets observed by the OGO 5 satellite in the solar wind near earth's bow shock. This paper studies the interaction of a whistler soliton with a tenuous electron beam that might be present near earth's bow shock. The cold plasma approximation is used for the whistler dispersion relation, and three time scales are distinguished: a fast time scale associated with the whistler frequency, an intermediate scale associated with the linear growth rate of the modulational instability leading to soliton formation, and a slow scale determined by the rate of energy exchange between the nonlinear wave and the charged particles. The analysis indicates that soliton energy is transformed mainly into transverse electron motion and that a reduction in kinetic energy occurs in the direction parallel to the external magnetic field. Applying the results to the solar wind, it is shown that there can be efficient energy transfer from the soliton to the electrons, resulting in energy gain by the beam. The validity of the theory is discussed.

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