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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 6
Ann. Geophys., 13, 573–582, 1995
https://doi.org/10.1007/s00585-995-0573-2
© European Geosciences Union 1995
Ann. Geophys., 13, 573–582, 1995
https://doi.org/10.1007/s00585-995-0573-2
© European Geosciences Union 1995

  30 Jun 1995

30 Jun 1995

ULF/ELF monochromatic oscillations observed by Prognoz-8 and -10 spacecrafts during quasiperpendicular supercritical shock crossings

M. N. Nozdrachev, A. A. Petrukovich, and J. Juchniewicz M. N. Nozdrachev et al.

Abstract. The present paper analyses electromagnetic turbulence in the frequency range 0.1–75 Hz, associated with the supercritical quasiperpendicular crossings of the Earth's bow shock recorded by the Prognoz-8 and -10 satellites. The quasimonochromatic waves are identified in the shock transition region. Their frequencies, lying in the range 2–5 Hz upstream from the shock ramp, shift to a value less than 1 Hz in the downstream region. The amplitudes of these narrow emissions are great enough to provide the primary dissipation in the flow of the solar wind plasma. Electromagnetic oscillations with such properties are likely to be generated during non-linear evolution of the shock front, rather than by the instabilities driven by ion and electron drifts. Emissions with frequencies higher than 5 Hz have much smaller amplitudes and may be driven by lower hybrid-like instabilities.

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