Effects of Fluctuations on Acceleration at Shocks, with Application to the Termination shock

Details Effects of Fluctuations on Acceleration at Shocks, with Application to the Termination shock Effects of Fluctuations on Acceleration at Shocks, with Application to the Termination shock

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh24a..07j&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH24A-07

Physics

2124 Heliopause And Solar Wind Termination, 2159 Plasma Waves And Turbulence, 7514 Energetic Particles (2114), 7807 Charged Particle Motion And Acceleration

Scientific paper

We consider the acceleration of charged particles and anomalous cosmic rays (ACR) at propagating shocks and especially at the heliospheric termination shock, when upstream turbulence or geometry causes spatial and temporal variations of the shock. These may help us to understand the heretofore puzzling observations of energetic particles of both propagating shocks and the termination shock. Upstream turbulence has a broad spectrum and produces both temporal and spatial variations along the shock face and also normal to the shock. In addition, the non-spherical geometry of the heliosphere produces longer- term and larger-scale spatial variations. We will present the results of a new analytic solution and simulations. We find that, downstream of the shock, increasing (positive) spatial gradients together with modulation-like spectral turnovers and multiple-power-law spectral features can be produced by plausible fluctuations at the shock. Such effects also result in our calculations from large-scale, or global, spatial structure. These various effects will be compared with observations energetic particles associated with propagating heliospheric shocks and Voyager observations of ACRs near the termination shock and in the heliosheath.

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