Diffusive-Compressive Acceleration of Charged Particles

Details Diffusive-Compressive Acceleration of Charged Particles Diffusive-Compressive Acceleration of Charged Particles

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh22a0752j&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH22A-0752

Statistics

Applications

2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 2139 Interplanetary Shocks

Scientific paper

We consider the transport of energetic particles in a medium through which gradual (non-shock) compressions exist and propagate. As is the case with shocks, these compressions can accelerate charged particles. We have previously considered such acceleration in the specific context of CIRs (Giacalone, J., Jokipii, and Kóta, Joint SOHO-ACE Symposium Proceedings, in press, 2001). There we suggested that it may explain CIR-related energetic particles observed in the inner Heliosphere, near 1 AU, well inside of the radius where the co-rotating shock has formed. Here we extend this concept to the general problem of acceleration by non-shock compressions, and consider primarily the limit in which the particle motion is diffusive. The relevant dimensionless parameter is the ratio Rc of the characteristic compression length scale L to the diffusive skin depth Δ D = κ /U , where U is the velocity and κ is the diffusion coefficient. Clearly, Rc = U L/κ . If Rc << 1 , the results reduce to those of diffusive shock acceleration. We present the results from solving the transport equation for a variety of compressive disturbances with various values of Rc, and find significant charged-particle acceleration. We discuss the physics of this acceleration and the dependence on the various parameters. Possible applications of this mechanism to heliospheric and other contexts will be discussed. We sugggest that in some cases this new form of acceleration may help to explain observations.

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