Kinetic Structure of the Heliospheric Termination Shock and Implications for Pickup Ion Injection

Details Kinetic Structure of the Heliospheric Termination Shock and Implications for Pickup Ion Injection Kinetic Structure of the Heliospheric Termination Shock and Implications for Pickup Ion Injection

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..719..311s&link_type=abstract

PHYSICS OF THE OUTER HELIOSPHERE. AIP Conference Proceedings, Volume 719, pp. 311-316 (2004).

Physics

4

Particle Emission, Solar Wind, Planetary Bow Shocks, Interplanetary Shocks, Particle Acceleration, Solar Wind Plasma, Sources Of Solar Wind

Scientific paper

Kinetic aspects of a collisionless termination shock are discussed in the context of pickup ion injection into a diffusive acceleration mechanism. For the surfing (or multiply reflected ion) mechanism at an almost perpendicular termination shock to be effective the cross-shock potential has to be of the order of several electron inertial lengths or smaller. Such small scales are only possible for shocks with an ion beta of about 0.1 or less. An alternative mechanism is discussed which is based on the result that pickup ions are easily reflected at quasi-parallel shocks. Assuming that the termination shock, due to a turbulent upstream magnetic field, is locally quasi-parallel, pickup ions are efficiently accelerated to several hundreds of keV within about 10 hours, from where a second diffusive process can accelerate them to ACR energies.

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