Two-dimensional particle simulation of electromagnetic field signature associated with electrostatic solitary waves

Details Two-dimensional particle simulation of electromagnetic field signature associated with electrostatic solitary waves Two-dimensional particle simulation of electromagnetic field signature associated with electrostatic solitary waves

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10902207u&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A2, CiteID A02207

Physics

Plasma Physics

10

Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Numerical Simulation Studies, Space Plasma Physics: Waves And Instabilities, Space Plasma Physics: Nonlinear Phenomena

Scientific paper

We present particle simulations of electrostatic solitary waves (ESW) observed by the Geotail spacecraft and recent spacecraft in the Earth's magnetosphere. Recent particle simulations have demonstrated that ESW correspond to Bernstein-Greene-Kruskal electron holes formed through nonlinear evolution of electron beam instabilities. Since an electron hole is a coherent electrostatic potential structure, electron beam instabilities were conventionally studied by electrostatic particle simulations. However, the Polar spacecraft and FAST spacecraft observed electromagnetic field signatures associated with ESW. To study interaction between coherent electrostatic potentials and electromagnetic waves, we extend the previous electrostatic particle model to an electromagnetic particle model. In the present two-dimensional simulations of an electron beam instability, electromagnetic field components are enhanced around two-dimensional electron holes. We found that the enhancement of electromagnetic fields is due to a current formed by electrons undergoing the E × B0 drift, where the electric field is a perpendicular electrostatic field at the edge of a two-dimensional electron hole. An electromagnetic beam mode is excited by the current due to the drifting electrons moving with the electron hole. The amplitude ratio of the electric field to the magnetic field is estimated on the basis of the present simulation result, and it is in agreement with those of the Polar and FAST observations.

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