ULYSSES near-ecliptic observations of differential flow between protons and alphas in the solar wind

Details ULYSSES near-ecliptic observations of differential flow between protons and alphas in the solar wind ULYSSES near-ecliptic observations of differential flow between protons and alphas in the solar wind

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.2505n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A2, p. 2505-2511

Other

27

Alpha Particles, Flow Distribution, Flow Velocity, Magnetohydrodynamic Waves, Protons, Solar Wind, Coulomb Collisions, Ion Motion, Particle Acceleration, Satellite Observation, Ulysses Mission

Scientific paper

The evolution of differential streaming between protons and alpha particles in the solar wind was observed with the solar wind plasma experiment on the Ulysses spacecraft over the solar range of 1.15 to 5.40 AU between November 18, 1990, and May 5, 1992. The correlation of the difference in ion speeds, Delta V = the absolute value of Valpha - the absolute value of Vp, with the proton speed Vp observed by other spacecraft at solar distances less than or equal to 1 AU disappeared at approximately 2 AU. At solar distances greater than or equal to 2.85 AU, the largest values of both Valpha p = the absolute value of Valpha p = the absolute value of Valpha - Vp and the absolute value of Delta V were found in the interaction regions on the leading edges of high-speed streams. The differential streaming was typically enhanced just downstream of strong forward and reverse shocks, and large negative values of Delta V were frequently encountered in the interaction regions. A correlation between Valpha p and the ratio tauzero/taue of Coulomb collision time to expansion time was observed at all distances, but it is suggested that at the larger values of tauzero/taue observed correlation may arise from enhanced production of differential streaming by processes that also increase the entropy of the solar wind protons.

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