The Dominance of Electron Plasma Waves in a Reconnection X-Line Region

Physics

Scientific paper

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2712 Electric Fields (2411), 2731 Magnetosphere--Outer, 2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2772 Plasma Waves And Instabilities

Scientific paper

As previously reported by Oieroset et al., [2000], the Wind spacecraft made a fortuitous encounter in April 1999 with an active X-line reconnection region in the geomagnetic tail. The plasma flow signatures included a set of two reversals of bulk flow velocity from earthward to tailward, and then tailward to earthward again. We report here on the associated plasma wave observations made concurrently with the X-line crossings. Specifically, we find that emissions at the local upper hybrid frequency intensify greatly, with amplitudes near 20 mV/m detected in the region. Also, there is the occurrence of broadband electrostatic noise (BEN) very near the crossing that appears as a set of electrostatic solitary waves (ESWs). A most striking observation is the lack of intense electromagnetic emission in the 10's of Hz (i.e., lower hybrid emissions). We discuss a mechanism by which such high frequency waves may be involved in the diffusive transport of plasma in the region.

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