High-velocity tails on the velocity distribution of solar wind ions

Details High-velocity tails on the velocity distribution of solar wind ions High-velocity tails on the velocity distribution of solar wind ions

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3605o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3605-3611.

Physics

17

Ion Distribution, Proton Flux Density, Solar Wind Velocity, Velocity Distribution, Maxwell-Boltzmann Density Function, Solar Instruments, Ulysses Mission

Scientific paper

Recent observations of the solar wind using the SWICS instrument on the Ulysses spacecraft have shown the presence of high-velocity 'tails' on the velocity distribution of protons. Similar features have also been observed on the velocity distributions of helium and oxygen ions. Of the order of 1 percent of the solar wind density is involved in these tails, which are approximately exponential in shape and persist to V = V(B) + 10V(th) or beyond, where VB is the bulk velocity and V(th) the thermal velocity of the solar wind. This paper contains a preliminary description of the phenomenon. It is clear that it is ultimately connected with the passage of interplanetary shocks past the spacecraft and that particle acceleration at oblique shocks is involved.

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