Deviations From the Predictions of Standard Diffusive Shock Acceleration

Details Deviations From the Predictions of Standard Diffusive Shock Acceleration Deviations From the Predictions of Standard Diffusive Shock Acceleration

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsh53a..04j&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SH53A-04

Physics

Space Physics

7807 Charged Particle Motion And Acceleration, 7845 Particle Acceleration, 7851 Shock Waves (4455)

Scientific paper

The mechanism for the acceleration of energetic charged particles remains one of the most important problems of space physics. Diffusive shock acceleration, now almost three decades old, has many attractive features and has become the most popular mechanism. However, it is becoming increasingly clear that in situ observations of energetic particles and shock waves often show very poor agreement with the basic theoretical predictions. Often the energetic-particle enhancements are not observable or occur at a time displaced from the shock passage. Observations from two or more spacecraft show different energetic-particle profiles on the same propagating shock. Statistical studies show poor agreement between the spectrum of energetic particles and the parameters of the shock. Finally, energetic electrons are often observed, but the injection of electrons into diffusive shock acceleration is not understood. One obvious explanation for these discrepancies is that diffusive shock acceleration is not the accelerator of the energetic particles. However, viable alternative mechanisms are so far lacking. Another possibility, diffusive shock acceleration in the presence of broad-band turbulent fluctuations in the upsream fluid will be shown to be a promising solution.

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