Plasma fluctuations in the solar wind

Details Plasma fluctuations in the solar wind Plasma fluctuations in the solar wind

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1027n&link_type=abstract

Journal of Geophysical Research, vol. 83, Mar. 1, 1978, p. 1027-1034.

Physics

26

Magnetic Variations, Plasma Oscillations, Power Spectra, Solar Magnetic Field, Solar Wind, Infrasonic Frequencies, Ogo-5, Plasma Waves, Solar Spectra, Solar Wind Velocity

Scientific paper

Using Ogo 5 plasma and magnetic field data, the power spectra of solar wind fluctuations are calculated over the 10 to the -3 to 10 to the -1 Hz range. It is found that the spectra calculated from flux measurements equal the density power spectra times the square of the average solar wind speed. The power spectrum relative density is of the same order of magnitude as the power spectrum of speed fluctuations relative to the Alfven speed. In cases where density and field fluctuations are inconsistent with magnetosonic waves, static inhomogeneities with a balance between electron thermal and magnetic pressures is assumed. It is also felt that a resonant proton cyclotron instability driven by the solar wind's proton thermal anisotropy may cause the observed power enhancements near 1 Hz.

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