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Wavelet application to the magnetic field turbulence in the upstream region of the Martian bow shockTarasov, V.; Dubinin, E.; Perraut, S.; Roux, A.; Sauer, K.; Skalsky, A.; Delva, M.
Earth, planets, and space, 01/1998, Volume: 50, Issue: 8Journal Article
Wavelet analysis of the magnetic field fluctuations in the Martian foreshock is performed. Dynamical features of wave spectra are compared with plasma measurements of backstreaming ions and simulation results for all available data from the Phobos-2 spacecraft. A detailed analysis reveals the complex, fine structure of the ULF waves. It is shown that enhancement of this electromagnetic activity (mostly, at frequencies higher than the proton gyrofrequency) coincides with entry of the spacecraft into a bunch of exospheric protons reflected from the bow shock. Emissions near cyclotron frequencies of H+, He+, O+ are also recorded. These waves indicate pickup processes in the upstream region of Mars.
