Electrostatic solitary waves carried by diffused electron beams observed by the Geotail spacecraft

Details Electrostatic solitary waves carried by diffused electron beams observed by the Geotail spacecraft Electrostatic solitary waves carried by diffused electron beams observed by the Geotail spacecraft

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10414627o&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A7, p. 14627-14638

Physics

Plasma Physics

31

Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Magnetotail, Space Plasma Physics: Nonlinear Phenomena, Space Plasma Physics: Electrostatic Structures

Scientific paper

We study waveforms of electrostatic solitary waves (ESW) and corresponding electron velocity distribution functions observed by the Geotail spacecraft. When we observe a series of ESW in the plasma sheet boundary layer of the Earth's magnetotail, we find enhanced fluxes of high-energy electrons flowing along the ambient magnetic field. We find good correlation between the propagation direction of the ESW and the direction of the enhanced high-energy electron flux. This supports the model proposed by computer simulations that ESW are formed by the electrons modulated through the bump-on-tail instability. The enhanced electron flux is regarded as the diffused electron beam after the saturation of the instability. From comparison between the variation of waveforms and the velocity of the electron beams, the spatial scales and depths of the ESW potentials and their propagation directions are estimated. We found both tailward and earthward ESW in the plasma sheet boundary layer, even in the deep magnetotail.

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