Polar Spacecraft Observations of Intense Wave Electric Fields in the Inner Magnetosphere

Details Polar Spacecraft Observations of Intense Wave Electric Fields in the Inner Magnetosphere Polar Spacecraft Observations of Intense Wave Electric Fields in the Inner Magnetosphere

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm31e..07w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM31E-07

Physics

7829 Kinetic Waves And Instabilities, 7845 Particle Acceleration, 7846 Plasma Energization

Scientific paper

This talk presents recent observations in the inner magnetosphere of extremely intense lower hybrid electric field structures/waves with amplitudes ranging up to 700 mV/m over the frequency range from 50-300 Hz using burst data from the Berkeley Electric Field Instrument (EFI) on the Polar spacecraft. These are among the most intense waves ever observed in the inner magnetosphere near and within the outer electron radiation belts. The waves were observed on the night-side near the equatorial plane(<30 degrees) at 4>c) dominated by the longitudinal component of the electric field. The wave fields are often found at the edges of order of magnitude density gradients and are associated with electron thermal flux fluctuations that are on the order of 30% of the estimated background electron density. The burst electric field data also provides evidence for 50-100 mV/m discrete bipolar solitary electric field structures directed parallel to the ambient magnetic field with durations on the order of ~ 1 ms imbedded in the large amplitude turbulence. The relation of these waves and structures to quasi-static electric fields associated with substorms, Alfven waves, the PSBL, and the acceleration of energetic electrons and ions will be discussed.

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