Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1302..119g&link_type=abstract
PICKUP IONS THROUGHOUT THE HELIOSPHERE AND BEYOND: Proceedings of the 9th Annual International Astrophysics Conference. AIP Con
Astronomy and Astrophysics
Astrophysics
Pickups, Interplanetary Magnetic Fields, Solar Wind, Acceleration, Pickup Ions, Interplanetary Dust And Gas, Particle Emission, Solar Wind, Particle Acceleration
Scientific paper
We apply test-particle numerical simulations to model the acceleration of inner-source C+ by a strong interplanetary shock. The model consists of three distinct parts: (a) the distribution of inner-source pickup ions; (b) the initial acceleration of pickup ions (to produce seed particles) for a kinematically defined interplanetary shock; and (c) the acceleration to higher energies and the resulting event-averaged energy spectrum seen by an observer at 1 AU based on the solution to the Parker transport equation for a propagating shock. Our results are compared with observational estimates of the upper bound on the spectrum of C+ ions associated with the Aug. 25, 1998 solar-energetic particle event. Our calculated spectrum is very close to this upper-bound estimate, suggesting that the intensity of accelerated C+ is just at the sensitivity of measurement.
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