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Waves in interplanetary shocks: a wind/WAVES study.

L B Wilson1, C Cattell, P J Kellogg

  • 1Department of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Physical Review Letters
|August 7, 2007
PubMed
Summary
This summary is machine-generated.

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This study analyzed 67 interplanetary shocks, finding large amplitude ion acoustic waves (IAWs) dominate shock ramps. These waves significantly increase anomalous resistivity, supporting theories of IAWs as primary dissipation mechanisms for low Mach number shocks.

Area of Science:

  • Space Physics
  • Plasma Physics
  • Astrophysics

Background:

  • Interplanetary (IP) shocks are crucial phenomena in space physics.
  • Understanding wave phenomena within shock structures is key to explaining energy dissipation.

Purpose of the Study:

  • To statistically analyze waveform capture data from interplanetary shocks.
  • To identify dominant wave types and their characteristics within shock regions.
  • To investigate the relationship between wave properties and shock parameters.

Main Methods:

  • Statistical analysis of waveform capture data from 67 interplanetary shocks.
  • Identification and characterization of wave phenomena (solitary waves, Langmuir waves, ion acoustic waves).
  • Correlation analysis between wave amplitude, Mach number, and shock strength.

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Main Results:

  • Most waveform captures and large amplitude waves occurred in the shock ramp region.
  • Large amplitude ion acoustic waves (IAWs) were the dominant wave type observed.
  • Wave amplitude showed a positive correlation with fast mode Mach number and shock strength.
  • Observed waves generated anomalous resistivities significantly higher than classical estimates.

Conclusions:

  • Ion acoustic waves (IAWs) are the primary drivers of anomalous resistivity in interplanetary shock ramps.
  • The findings support theoretical models attributing significant energy dissipation in low Mach number shocks to IAWs.