Broadband Electrostatic Waves in the Near-Earth Magnetotail*

Details Broadband Electrostatic Waves in the Near-Earth Magnetotail* Broadband Electrostatic Waves in the Near-Earth Magnetotail*

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apro16001g&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

A recent model for Broadband Electrostatic Noise (BEN), in which nonlinear trapped-particle modes only occur in the top of the observed spectrum, whereas the bulk of the spectrum below that consists of standard modes driven by unstable particle beams, predicts that the solitary waves are only present in the source region, whereas they are not in BEN that has propagated well outside the source region. As a test of these predictions, observations were examined from POLAR of BEN obtained near the Earth. The wave data examined for BEN poleward of the near-Earth PSBL exhibit frequent turbulent waveforms, but little evidence of solitary waves. However, the wave data near the narrower PSBL source region shows a persistent level of turbulence, within which solitary-like waves are embedded, several of which saturate the receiver. The non-solitary portion of the observed wave data, which appears over a much broader regions, fits well the theory of standard beam instabilities. These solitary waves have different structures parallel and perpendicular to the magnetic field, with this structure differing from the Geotail observations further out in the magnetotail. A theoretical analysis of generalized BGK equations is made for their implications for the source plasma in the near-Earth environment.

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