Electromagnetic lower hybrid waves, whistler waves, and particle heating/acceleration at supercritical interplanetary shocks

Details Electromagnetic lower hybrid waves, whistler waves, and particle heating/acceleration at supercritical interplanetary shocks Electromagnetic lower hybrid waves, whistler waves, and particle heating/acceleration at supercritical interplanetary shocks

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh53b2048w&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH53B-2048

Physics

Plasma Physics

Particle Acceleration, Interplanetary Shocks, Electromagnetic Lower Hybrid Waves, Whistler Waves, Particle Heating, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7845] Space Plasma Physics / Particle Acceleration, [7851] Space Plasma Physics / Shock Waves, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

We present the first study of electromagnetic lower hybrid and whistler waves with f_ci << f < f_ce at four supercritical interplanetary (IP) shocks using the Wind search coil magnetometer. Using cold plasma theory to estimate the wave numbers, we found the waves had 0.01 < (k rho_ce) < 4.0 for the observed frequencies. The waves can have amplitudes exceeding 10 nT with a broad range of propagation angles with respect to the magnetic field. The lower hybrid waves propagated at highly oblique angles with respect to the magnetic field while most of the whistler waves propagated within ~30 degrees of the magnetic field, consistent with theory and previous observations. We also present simultaneous observations of electromagnetic lower hybrid waves and particle distributions at IP shocks showing evidence of parallel electron energization and perpendicular ion heating consistent with theory of lower hybrid waves. We found evidence for gyrating ions near three of the IP shock ramps and all of the waves show a weak positive correlation between the wave amplitude and the magnitude of the electron heat flux. These observations suggest possible sources of free energy consistent with theory. Furthermore, all of the whistler waves in our study were found to satisfy the criteria determined by Gary et al., [1994] for a whistler heat flux instability. These results provide further evidence that wave-particle interactions are an important process at IP shocks.

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