Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh72b..03g&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH72B-03
Physics
2114 Energetic Particles, Heliospheric (7514), 2139 Interplanetary Shocks, 2152 Pickup Ions, 2164 Solar Wind Plasma
Scientific paper
Spectral characteristics and anisotropies of solar wind and pickup ions provide important clues concerning the injection, acceleration and transport properties of suprathermal particles. Elemental and charge-state composition of these ions give information on sources of accelerated particles in the heliosphere. Comprehensive and continuous measurements of H+, He+, and He++ with the Solar Wind Ion Composition Spectrometers (SWICS) on both Ulysses and ACE, are giving us a wealth of data that can be used to study pitchangle scattering, momentum diffusion and spatial diffusion of these particles in the solar wind. The observed velocity distribution functions in the range of W (ion speed/solar wind speed) between about 0.5 and 10 are found to be in general anisotropic. They are always non-maxwellian and have pronounced suprathermal tails. We will present velocity spectra found in the disturbed solar wind behind CIR and CME-driven shocks, and compare these to distributions in the quiet wind, far removed from shocks. Implications of these observations will be discussed.
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