Pickup Ion Transport and Acceleration in Turbulent Field-aligned Electric Fields in the Slow Low-latitude Solar Wind.

Details Pickup Ion Transport and Acceleration in Turbulent Field-aligned Electric Fields in the Slow Low-latitude Solar Wind. Pickup Ion Transport and Acceleration in Turbulent Field-aligned Electric Fields in the Slow Low-latitude Solar Wind.

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh21a0731l&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH21A-0731

Physics

2149 Mhd Waves And Turbulence, 2152 Pickup Ions

Scientific paper

Recent spacecraft observations reveal that energetic tails in ion spectra are present continually in the slow low-latitude solar wind, even in the absence of nearby shocks. To explain this phenomenon we take into account growing evidence that MHD turbulence in the solar wind has a strong two-dimensional (2D) component. 2D MHD turbulence simulations exhibit turbulent field-aligned electric fields. These turbulent field-aligned electric fields consist of a coherent large-scale component and an incoherent random small-scale component. First, we explore pickup ion propagation and acceleration between the Sun and Earth with a newly developed kinetic numerical model which includes the coherent large-scale component of the turbulent electric field. The electric field is consistent with observations in the low-latitude solar wind. The model is found to qualitatively reproduce the accelerated interstellar pickup He+ spectra observed at Earth. Like the observations, the simulated accelerated ``tail" is approximately a power law f(v) ~ v-4.5 until it reaches particle speeds about ten times the solar wind speed where a rollover occurs. Predictions for the energetic tails of interstellar pickup O+ and inner source pickup O+ is also presented. Second, we present a preliminary new Fokker-Planck kinetic theory for the transport and acceleration of low-energy superthermal charged particles by the incoherent random component of the turbulent electric field.

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