Large-amplitude electrostatic waves observed at a supercritical interplanetary shock

• Published in: Journal of Geophysical Research 2010-12, Vol.115 (A12), p.n/a
• Main Authors: Wilson III, L. B., Cattell, C. A., Kellogg, P. J., Goetz, K., Kersten, K., Kasper, J. C., Szabo, A., Wilber, M.
• Format: Article
• Language: English
• Subjects: Astrophysics; Atmospheric sciences; Bernstein waves; Earth sciences; Earth, ocean, space; Exact sciences and technology; Geophysics; interplanetary shocks; Ions; Magnetic fields; Magnetism; Planetology; Plasma physics; Solitary waves; Space
• ISSN: 0148-0227; 2169-9380; 2156-2202; 2169-9402
• DOI: 10.1029/2010JA015332

We present the first observations at an interplanetary shock of large-amplitude (> 100 mV/m pk-pk) solitary waves and large-amplitude (approx.30 mV/m pk-pk) waves exhibiting characteristics consistent with electron Bernstein waves. The Bernstein-like waves show enhanced power at integer and half-integer harmonics of the cyclotron frequency with a broadened power spectrum at higher frequencies, consistent with the electron cyclotron drift instability. The Bernstein-like waves are obliquely polarized with respect to the magnetic field but parallel to the shock normal direction. Strong particle heating is observed in both the electrons and ions. The observed heating and waveforms are likely due to instabilities driven by the free energy provided by reflected ions at this supercritical interplanetary shock. These results offer new insights into collisionless shock dissipation and wave-particle interactions in the solar wind.