Heliospheric ``FALTS'': Favored Acceleration Locations at the Termination Shock

Details Heliospheric ``FALTS'': Favored Acceleration Locations at the Termination Shock Heliospheric ``FALTS'': Favored Acceleration Locations at the Termination Shock

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30k..41s&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 11, pp. 41-1, CiteID 1587, DOI 10.1029/2002GL016499

Physics

Plasma Physics

8

Interplanetary Physics: Heliopause And Solar Wind Termination, Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Interplanetary Magnetic Fields, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, Space Plasma Physics: Shock Waves

Scientific paper

The standard explanation for Anomalous Cosmic Rays requires strong energization at the heliospheric termination shock. However, the tightly wrapped magnetic spiral in the outer heliosphere produces a quasi-perpendicular shock where it is difficult to accelerate low energy particles. We show that motion of footpoints between regions of fast and slow solar wind at the Sun, create non-spiral configurations and large radial components of the magnetic field. These regions preferentially inject low energy particles into diffusive shock acceleration. Further, footpoints that move from slow to fast source regions, generate field lines with local polarity inversions that connect to the termination shock at multiple locations. As these regions convect out, they trap particles between what are effectively two converging shocks, producing additional first-order Fermi acceleration. Heliospheric ``FALTS'' - Favored Acceleration Locations at the Termination Shock - should play an important role in particle acceleration in the outer heliosphere.

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