Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh53b..01s&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH53B-01
Physics
2114 Energetic Particles (7514), 2154 Planetary Bow Shocks, 7807 Charged Particle Motion And Acceleration, 7851 Shock Waves (4455)
Scientific paper
A variety of suprathermal and energetic ion distrbutions are found upstream of Earth's bow shock. The distributions can be broadly divided into specularly reflected ions, field-aligned beams, intermediate ions, and diffuse ions. In addition gyrophase bunched and more gyrotropic ring-beam distributions have been observed in certain foreshock regions. We will first review these observations and then critically discuss the current understanding of the creation and evolution of the suprathermal distributions at shocks. Processes include specular reflection, shock drift acceleration, multiple interactions with the shock during reflection, phase trapping of beam distributions, and diffusive acceleration. We will also discuss the processes which have been proposed for injection of solar wind ions into diffusive shock acceleration. Finally, we will point out open problems and suggest directions for future research.
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