Velocity and magnetic field fluctuations in Alfvénic regions of the inner solar wind: Three-fluid observations

Details Velocity and magnetic field fluctuations in Alfvénic regions of the inner solar wind: Three-fluid observations Velocity and magnetic field fluctuations in Alfvénic regions of the inner solar wind: Three-fluid observations

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105.5113b&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A3, p. 5113-5118

Physics

Plasma Physics

4

Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Mhd Waves And Turbulence, Interplanetary Physics: Solar Wind Plasma, Space Plasma Physics: Turbulence

Scientific paper

A three-fluid analysis of Alfvénic fluctuations in the solar wind is done using Helios 2 data. We focus on the relationship between velocity and magnetic field fluctuations, in particular, on the factor relating their amplitudes. As well known, the ratio of velocity to magnetic fluctuation amplitudes decreases with increasing heliocentric distance. However, this result comes from analyses that almost completely disregard the multifluid nature of the solar wind plasma. In the present study we reexamine some observations of Alfvénic fluctuations done by Helios 2 at 0.29 and 0.88 AU within the trailing edge of a high-speed stream, stimulated by the fact that in the investigated regions, and especially at 0.88 AU, an isotropic plasma approach appears to be too crude. In our analysis all effects of total mass density, total thermal anisotropy, and ion differential streamings for a plasma of protons, alpha particles, and electrons are taken into account. The results clearly indicate that the amplitude imbalance in favor of the magnetic fluctuations can only in part be accounted for by multifluid effects.

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