On the nature of compressive fluctuations in the solar wind

Details On the nature of compressive fluctuations in the solar wind On the nature of compressive fluctuations in the solar wind

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9921481t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A11, p. 21,481-21,509

Physics

38

Compressible Flow, Cross Correlation, Heliosphere, Magnetic Fields, Magnetohydrodynamic Flow, Pressure Effects, Solar Wind, Statistical Correlation, Field Strength, Helios 1, Helios 2, Magnetoacoustic Waves, Magnetohydrodynamics, Plasma Pressure

Scientific paper

A statistical analysis of the amplitudes of the thermal pressure and total pressure of the solar wind and of several related cross correlations between different compressive parameters has been performed with the plamsa and magnetic field data obtained by Helios 1 and 2 in their primary missions. The statistical analysis is based on small-band averages of the relevant spectra over the frequency range (2-5) x 10-4 Hz, corresponding to hourly timescales. With decreasing ratio between the fluctuation amplitudes of the total pressure and the density, we found a systematical decrease of the correlation coefficient between density and total pressure and of the correlation coefficient between density and magnetic field magnitide. Decreases of the correlation coefficients between temperature and density and between thermal and magnetic pressure are also found with decreasing ratio of the normalized amplitudes of the fluctuations of the thermal pressure and the temperature. Most of these results can be explained quantitatively by a model based on a superposition of small-amplitude perpendicular fast magnetosonic waves and small-amplitude pressure-balanced structures. We have found a class of data points which seem to represent fluctuations dominated by fast magnetosonic waves.

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