Polar Observations of Solitary Waves at the Earth's Magnetopause

Details Polar Observations of Solitary Waves at the Earth's Magnetopause Polar Observations of Solitary Waves at the Earth's Magnetopause

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm41b0790d&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM41B-0790

Physics

2724 Magnetopause, Cusp, And Boundary Layers, 2772 Plasma Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions, 7839 Nonlinear Phenomena, 7871 Waves And Instabilities

Scientific paper

Using Polar 3d electric field data at the subsolar, equatorial magnetopause, solitary waves have, for the first time, been identified at the magnetopause. These nonlinear, bipolar electric field pulses parallel to the magnetic field occur both as individual spikes and as trains of spikes. The solitary waves have amplitudes up to 25 mV/m, and velocities from 150 km/s to >2500 km/s, with scale sizes the order of a kilometer (comparable to the Debye length). Almost all the observed solitary waves are positive potential structures with potentials of 0.1 to 5 Volts. They are often associated with very large amplitude waves in either or both the electric and magnetic fields. Solitary waves have been observed at almost all magnetopause crossings at which a waveform capture was obtained. Although most of the observed signatures are consistent with an electron hole mode, the events with very low velocities and the few negative potential structures may be indicative of a second type of solitary wave in the magnetopause current layer. The solitary waves may be an important source of dissipation and diffusion at the magnetopause.

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