The Sources, Transport, and Acceleration of Pickup Ions in the Heliosphere

Details The Sources, Transport, and Acceleration of Pickup Ions in the Heliosphere The Sources, Transport, and Acceleration of Pickup Ions in the Heliosphere

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh72b..04s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH72B-04

Physics

2102 Corotating Streams, 2114 Energetic Particles, Heliospheric (7514), 2124 Heliopause And Solar Wind Termination, 2152 Pickup Ions

Scientific paper

Pickup ions in the heliosphere have four major sources: the interstellar source, the inner source caused by interaction between the solar wind and grains near the Sun, discrete sources such as comets, and the recently discovered outer source caused by sputtering of grains from the Kuiper belt. Much has been learned due to observations from Ulysses/SWICS and Wind/STICS about these sources, about their scattering among magnetic irregularities embedded within the solar wind, and about their acceleration near shocks and due to wave-particle interactions. In each of these areas, the theories of pickup ion interactions have improved our understanding, but important questions remain. Interstellar pickup ions are a known source of anomalous cosmic rays (ACRs) which are thought to be accelerated by diffusive shock acceleration at the solar wind termination shock. Recent ACR observations have revealed an "additional" population of ACRs that cannot be explained by the traditional interstellar source. The inner and outer pickup ion sources are the most promising candidates to explain these "additional" ACRs. The detailed nature of pickup ion acceleration inside the termination shock determines how these sources contribute to ACRs. The presentation will review these topics, with attention to the current challenges and revisions of understanding that have been triggered by pickup ion and energetic particle observations made over the last decade.

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