Correlated wave and particle observations upstream of the earth's bow shock

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Bow Waves, Magnetopause, Plasma Turbulence, Shock Waves, Solar Wind, Canonical Forms, International Sun Earth Explorers, Magnetohydrodynamic Flow, Solar Protons, Statistical Analysis

Scientific paper

Data from three ISEE experiments (the French electron density experiment, the Italian solar wind experiment, and the UCLA magnetometer experiment) are analyzed for several periods of turbulence observed in the solar wind upstream of the earth's quasi-parallel bow shock. One typical nine-hour period on November 9, 1977 is examined in some detail in order to illustrate the parameters studied and the correlations found. It is shown that during this period the radio noise spectrum has two components, one centered at the local electron plasma frequency and the other at somewhat lower frequencies; the latter component has a shorter wavelength and correlates with the level of MHD turbulence. A multivariate canonical statistical analysis of particle and MHD data during a two-week period shows that the proton anisotropy and turbulence level correlate well with the minimum backstreaming proton parallel velocity.

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