ULF/ELF electromagnetic waves associated with the quasiperpendicular Earth's bow shock crossings

Physics

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Bow Waves, Collisionless Plasmas, Electromagnetic Surface Waves, Planetary Boundary Layer, Plasma Spectra, Plasma Turbulence, Shock Waves, Boundary Layer Transition, Doppler Effect, Extremely Low Radio Frequencies, Prognoz Satellites, Solar Wind

Scientific paper

The analysis of electromagnetic turbulence in the frequency range 0.1 to 75 Hz, associated with crossings of the Earth's bow shock recorded by the Prognoz 8 and 10 satellites, is reported. The quasi-monochromatic waves are identified in the shock transition region. Their frequencies, which lie in the range from 2 to 6 Hz upstream the shock ramp, shift to the values less than 1 Hz in the downstream region. The amplitudes of these narrow emissions are high enough to provide the dissipation in the flow of the solar wind plasma. It is argued that spectra shapes in this frequency range 0.1 to 75 Hz are strongly affected by the Doppler shift.

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