Self-consistent stochastic preacceleration of interstellar pickup ions in the solar wind including the effects of wave coupling and damping

Details Self-consistent stochastic preacceleration of interstellar pickup ions in the solar wind including the effects of wave coupling and damping Self-consistent stochastic preacceleration of interstellar pickup ions in the solar wind including the effects of wave coupling and damping

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.4799l&link_type=abstract

Journal of Geophysical Research, vol. 103, p. 4799

Physics

25

Stochastic Processes, Self Consistent Fields, Solar Wind, Interstellar Gas, Acceleration (Physics), Photoionization, Helium Ions, Hydrogen Ions, Oxygen Ions

Scientific paper

A self-consistent model was developed to study the stochastic acceleration of interstellar pickup ions in the quiet solar wind (SW) and inside corotating merged interaction regions (CMIRs) in the presence of the effects of wave coupling and the damping of MHD waves by pickup ions. Our simulations of the solar wind wave spectrum show that pickup H+ is mainly responsible for wave damping at large wave numbers with pickup He+ contributing very little and pickup O+ contributing nothing. Strong wave-wave interactions wash out wave-damping effects for radial distances of 10 AU or less from the sun in the quiet solar wind and for r of 23 AU or less inside corotating merged interaction regions. For the simulated pickup ion spectra it is found that the pickup He+ and O+ spectra are unaffected by the wave damping while the accelerated pickup H+ spectra have concave features for kinetic energies 1-5 KeV which become more pronounced with increasing radial distance. This suppression of the pickup H+ acceleration is attributed to the wave damping caused by the pickup H+. Inside corotating merged interaction regions the preacceleration of pickup ions is stronger because of the enhanced hellospheric magnetic field. The suppression of pickup H+ acceleration is smaller and only starts to show for r greater than 23 AU.

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