Large-amplitude electrostatic waves associated with magnetic ramp substructure at Earth's bow shock

Details Large-amplitude electrostatic waves associated with magnetic ramp substructure at Earth's bow shock Large-amplitude electrostatic waves associated with magnetic ramp substructure at Earth's bow shock

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3315104h&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 15, CiteID L15104

Physics

Plasma Physics

9

Space Plasma Physics: Shock Waves (4455), Space Plasma Physics: Turbulence (4490), Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Interplanetary Physics: Planetary Bow Shocks, Interplanetary Physics: Interplanetary Shocks

Scientific paper

We present Polar observations of high frequency (100 Hz $\lesssim$ f $\lesssim$ 4000 Hz) electrostatic (ES) waves at Earth's bow shock under extreme solar wind conditions. Although solitary waves are observed, the most prevalent structures in the magnetic ramp are coherent, large-amplitude (up to 80 mV/m) ES wave packets, which last 10-30 cycles, and propagate at varied obliquities relative to the magnetic field. The ES wave power is well correlated with maxima in the magnetic ramp substructure, suggesting that these maxima are important source regions. Detailed interferometric based analysis of waveforms show that they have wavelengths of a few hundred meters (e.g., ~20λD ~ 0.5ρe) and phase speeds at the acoustic speed, suggesting that they are ion acoustic waves (IAW)s. The IAWs, having potentials $\lesssim$1 V with no net change, are not likely to affect bulk plasma energization, though they may scatter the plasma and thus affect plasma thermalization.

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