Temperature Anisotropies of Heavy Solar Wind Ions from Ulysses-SWICS

Details Temperature Anisotropies of Heavy Solar Wind Ions from Ulysses-SWICS Temperature Anisotropies of Heavy Solar Wind Ions from Ulysses-SWICS

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..679..526v&link_type=abstract

SOLAR WIND TEN: Proceedings of the Tenth International Solar Wind Conference. AIP Conference Proceedings, Volume 679, pp. 526-5

Computer Science

2

Particle Emission, Solar Wind, Solar Wind Plasma, Sources Of Solar Wind

Scientific paper

We report the first in-situ measurements of temperature anisotropies of heavy ions in the solar wind, obtained with the Solar Wind Ion Composition Spectrometer (SWICS) on the Ulysses spacecraft. Since SWICS measures only 1-dimensional cuts through the full, 3-d velocity distribution functions we resort to a statistical approach, separating the particle data according to the instantaneous magnetic field angle. We apply this analysis to the ions of He++ and O6+ during extended time periods in the fast streams from both the south and the north polar coronal holes that Ulysses traversed in 1993-96. In both cases we find anisotropies of the order of T⊥/T∥ = 0.8. The results of this study are discussed in relation to the observations made on Helios for He++ in the 1970s, and to recent observations made on SOHO-UVCS, which show extreme temperature anisotropies of O VI, or O5+, at a few solar radii.

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