Production, transport and acceleration of pickup ions in the heliosphere: implication to ENA observations by IBEX

Details Production, transport and acceleration of pickup ions in the heliosphere: implication to ENA observations by IBEX Production, transport and acceleration of pickup ions in the heliosphere: implication to ENA observations by IBEX

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh23b1953z&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH23B-1953

Astronomy and Astrophysics

Astrophysics

[2109] Interplanetary Physics / Discontinuities, [2124] Interplanetary Physics / Heliopause And Solar Wind Termination, [2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles

Scientific paper

Pickup ions are produced when interstellar neutrals penetrate into the heliosphere and ionized either by solar wind ions through charge exchange or by solar UV light. While both processes produce pickup ions, only the charge exchange also produces a neutral solar wind, which emits radially out from the sun with the solar wind speed and can penetrate through the heliopause into interstellar medium. It has been proposed (Schwadron et al. 2009, Science, 326, 966; Heerikhuisen et al., 2010, Astrophys. J. Lett. 708, L126-L130) that the neutral solar wind atoms can come back to the inner heliosphere through multiple charge exchanges outside of the heliopause and they form an apparent ribbon in the IBEX ENA image. Pickup ions are transported with the solar wind to outer heliosphere. They are accelerated by magnetic field turbulence or the termination shock. Further charge exchange with the interstellar neutrals produces ENA that can come back to the inner heliosphere and be seen as a diffuse component in IBEX images. In the paper, we make full simulation of pickup ion production, transport and acceleration in an MHD model heliosphere. Our model includes self-consistent treatment of pickup ions and magnetic field turbulence. We show how pickup ion distribution function evolves radially from the inner heliosphere to the inner heliosheath in all directions. Implications of the pickup ion distribution to the anisotropy of ENA fluxes including those from the ribbon region will be discussed.

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