Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh21c..07c&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH21C-07
Physics
7867 Wave/Particle Interactions, 2114 Energetic Particles, Heliospheric (7514), 2164 Solar Wind Plasma
Scientific paper
During 1995 the Wind spacecraft encountered regular and distinct intervals of high and low-speed solar wind at a time of low solar activity. Data obtained by the Solar Wind Experiment (SWE) Faraday Cup detectors for this period have been analysed to investigate occasions when the solar wind proton velocity distribution can be resolved into two distinct proton components. During these instances of proton double streaming the proton velocity distribution displays non-thermal features such as field-aligned high-energy shoulders or pronounced double peaks. Where possible the observations have been fit using a model comprising of two bi-Maxwellian distributions. The results thus form the first large-scale statistical survey of proton double streaming using Wind data. Proton double streaming was found to occur three times more often in high-speed (> 600 km/s) solar wind flows than in low-speed (< 400 km/s) flows. In addition, between each type of solar wind flow there are clear differences in the relative densities, relative velocities, and temperature anisotropies of the primary and secondary proton components, perhaps indicative of the different plasma processes and instabilities giving rise to their creation/destruction.
Clack D.
Kasper Justin Christophe
Lazarus Andrew J.
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