Interplanetary magnetic field power spectra - Mean field radial or perpendicular to radial

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Interplanetary Magnetic Fields, Magnetic Field Configurations, Pioneer 6 Space Probe, Power Spectra, Autocorrelation, Coherent Radiation, Frequency Measurement, Frequency Ranges, Magnetic Flux, Magnetoacoustic Waves, Phase Velocity, Radial Distribution, Solar Wind Velocity, Spatial Distribution, Wave Propagation

Scientific paper

A detailed frequency analysis of Pioneer-6 interplanetary magnetic field data is carried out for 5 to 15 hour periods during which the mean interplanetary field is approximately radial or perpendicular to radial. The reason why these data sets were chosen is that by making the usual assumption that the phase speed of any wave present is much less than the mean solar wind speed, the measured frequency spectra can be interpreted in terms of the wave number parallel or perpendicular to the mean field, without such additional assumptions as isotropy or the dominance of a particular mode and without measurements of velocity and density. The details of the calculation of the magnetic field power spectra, coherencies, and correlation functions are discussed, along with results obtained directly from the data (such as spectra, slopes, anisotropies, and coherencies). The results are interpreted in terms of MHD theory, and are related to work in other areas.

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