Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm11a0308k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM11A-0308
Physics
2154 Planetary Bow Shocks, 7845 Particle Acceleration, 7859 Transport Processes
Scientific paper
We used multipoint observations by the four Cluster spacecraft during time periods when the spacecraft separation was between 1 and 1.5 Earth radii to study diffusive transport in the upstream region and the efficiency of ion acceleration at the bow shock. We determined spatial gradients by measuring partial proton intensities in the energy range 27.7 keV to 92.2 keV as a function of distance from the bow shock along the magnetic field, using data from the RAPID (Research with Adaptive Particle Imaging Detectors) experiments onboard Cluster 1 and Cluster 3. Combining RAPID data with CIS data at lower energies (Kis et al., 2004), we find that the e-folding distance increases from lower to higher energies, with an approximately linear dependence on energy. Assuming that upstream diffusion is balanced by downstream convection we determine the spatial diffusion mean free path parallel to the magnetic field as a function of energy.
Daly Patrick W.
Klecker Berndt
Kronberg E. A.
Lucek Elisabeth A.
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