Correlations between the fluctuations of pressure, density, temperature and magnetic field in the solar wind

Details Correlations between the fluctuations of pressure, density, temperature and magnetic field in the solar wind Correlations between the fluctuations of pressure, density, temperature and magnetic field in the solar wind

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..659m&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 8, p. 659-677.

Physics

28

Pressure Oscillations, Solar Magnetic Field, Solar Temperature, Solar Wind, Statistical Correlation, Correlation Coefficients, Heliosphere, Magnetohydrodynamic Waves

Scientific paper

Compressive fluctuations and the pressure balance in the solar wind are investigated with Helios data obtained in 1975-1976 from measurements in the inner heliosphere between 0.3 and 1.0 AU. Broadband correlation spectra and hourly correlation coefficients for any pair of solar wind parameters like speed, density, temperature, magnetic field magnitude, thermal and magnetic pressure, and the total pressure of the plasma are calculated and analyzed. We find that the nature and intensity of the compressive fluctuations strongly depend on the flow speed and systematically vary with the stream structure. A general tendency is observed for the thermal and magnetic pressures to be anticorrelated. Particularly in the fast streams, the temperature fluctuations contribute predominantly to the pressure balance. Clear positive correlations between the solar wind (proton) temperature and speed are found in the higher-frequency domain for most of the cases considered. Significant positive correlations between the relative fluctuations of the total pressure and the density are obtained, particularly in high-speed streams, a result indicating the existence of fast magnetoacoustic waves.

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