Monte-Carlo Simulation of Pickup Ion Velocity Distributions in the Inner Heliosphere

Details Monte-Carlo Simulation of Pickup Ion Velocity Distributions in the Inner Heliosphere Monte-Carlo Simulation of Pickup Ion Velocity Distributions in the Inner Heliosphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh23b1955b&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH23B-1955

Physics

Plasma Physics

[7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7827] Space Plasma Physics / Kinetic And Mhd Theory, [7837] Space Plasma Physics / Neutral Particles

Scientific paper

Using Monte-Carlo simulations with simple assumptions on the pitch-angle scattering, we investigate the structure of pickup ion velocity distributions from the inner source and from interstellar helium penetrating inside 1 AU. A large body of pickup ion measurements from Ulysses, ACE, and STEREO exists, and our motivation is to investigate which scattering laws are best able to reproduce the observed distributions. For inner source pickup ions, we assume the ions to be generated in the region from 0.2 to 1 AU according to a plausible distribution. For the pickup ions from interstellar helium, we use realistic conditions of instreaming gas with a drift velocity of 22.8 km/s at infinity, and a temperature of 6000 K as recently determined with IBEX. These ionization conditions correspond to periods of high solar activity. The pickup ions are transported outward in a Parker spiral magnetic field, undergoing adiabatic focusing and simultaneous pitch-angle scattering. We choose Monte-Carlo coefficients for the pitch-angle scattering events to correspond to various assumptions of the quasilinear theory in typical solar wind wave spectra. We will report on the results and the comparison with distributions observed at 1 AU.

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