Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1039..168s&link_type=abstract
PARTICLE ACCELERATION AND TRANSPORT IN THE HELIOSPHERE AND BEYOND: 7th Annual International Astrophysics Conference. AIP Confer
Astronomy and Astrophysics
Astrophysics
Astronomical Observations, Particle Acceleration, Astronomical And Space-Research Instrumentation, Magnetohydrodynamics And Plasmas, Origin, Formation, And Abundances Of The Elements, Planetary Bow Shocks, Interplanetary Shocks, Flares
Scientific paper
We are in the process of building a data base of energetic particle and magnetic field measurements in the vicinity of interplanetary shocks in order to test several existing and emerging theories for particle acceleration and wave excitation in these environs. At present we have over 40 such intervals analyzed and the set is growing. We show here that there exist clear examples of shock acceleration to ~200 keV while in the presence of an intense energetic proton (SEP) population where the seed ions for shock acceleration come from the cold background protons that make up the thermal plasma. This happens in spite of the existence of a potential seed population made up of pre-energized ions. We also show that at higher energies the seed ions are formed from the pre-energized background, indicating that both sources are possible.
Culver Adrian B.
Haggerty Dennis K.
Hu Qiang
Isman Gabriel E.
Laforet Zachary W.
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