The amplitudes of interplanetary fluctuations - Stream structure, heliocentric distance, and frequency dependence

Details The amplitudes of interplanetary fluctuations - Stream structure, heliocentric distance, and frequency dependence The amplitudes of interplanetary fluctuations - Stream structure, heliocentric distance, and frequency dependence

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.4203r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 4203-4216.

Physics

96

Fluctuation Theory, Interplanetary Magnetic Fields, Magnetohydrodynamic Waves, Wentzel-Kramer-Brillouin Method, Amplitudes, Frequency Distribution, Magnetohydrodynamic Stability, Solar Wind, Velocity Distribution

Scientific paper

A study is presented of the heliocentric distance, frequency, and stream structure dependence of the amplitudes of interplanetary fluctuations in the velocity and magnetic field from 0.3 to nearly 20 AU and for spacecraft-frame periods of 10 days to a few hours. Evidence is presented that, at a given heliocentric distance, the amplitude of the magnetic field fluctuations is proportional to the magnitude of the field, nearly independently of the solar wind speed. The radial evolution of magnetic fluctuations is shown to be nearly consistent with WKB expectations except at smaller scales in the inner heliosphere and at the largest scales in the outer heliosphere. While the large-scale velocity fluctuations are kinetic energy-dominated in the inner heliosphere due to the presence of streams, the magnetic fluctuation energy eventually comes to be slightly dominant over the kinetic energy at all scales. The theoretical implications of the results are considered.

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