From Interstellar Pickup Ions in the Inner Heliosphere to Anomalous Cosmic Rays in the Heliosheath (Invited)

Details From Interstellar Pickup Ions in the Inner Heliosphere to Anomalous Cosmic Rays in the Heliosheath (Invited) From Interstellar Pickup Ions in the Inner Heliosphere to Anomalous Cosmic Rays in the Heliosheath (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh24a..01g&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH24A-01

Physics

[2104] Interplanetary Physics / Cosmic Rays, [2114] Interplanetary Physics / Energetic Particles, [2152] Interplanetary Physics / Pickup Ions

Scientific paper

Pickup ions are created by ionization of slow moving interstellar neutrals that penetrate deep into the heliosphere. As they are swept outward, carried by the solar wind, their velocity distributions and those of the associated suprathermal tails evolve so that by the time they reach the termination shock, their pressure far exceeds that of the solar wind. In crossing the termination shock, the pressure of both the pickup ions and their tails is increased by factors of 10 to 50 according to Rankine-Hugoniot conditions. Continuing their journey in the heliosheath, the rollover energy of the suprathermal tails increases, and these tails become the Anomalous Cosmic Rays (ACRs) near the heliopause. Measurements of pickup ion abundances in the inner heliosphere with Ulysses and that of suprathermal tails and ACRs in the heliosheath with Voyagers reveal the composition of the interstellar neutral gas. We will present observations of pickup ions and their suprathermal tails in the inner heliosphere and relate these to direct and indirect measurements of pickup ions, suprathermal tails and ACRs in the heliosheath with Voyagers and IBEX.

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