First principles physics for charged particle transport in strong space and astrophysical magnetic turbulence



The properties of transport of energetic particles in a strong magnetic turbulence have been investigated in the last few years mostly through numerical simulations, due to the technical difficulties of pursuing an analytical investigation. Moreover, previous approaches could only be applied to a limited number of turbulence power spectra. Analytical treatments have often the limitation of assuming a priori that the particle transport attains a diffusion regime, whereas it has been shown theoretically that different turbulence power spectra induce different particle behaviours in the diffusive regime. We will discuss the main assumptions made in the current theoretical treatments and how go beyond them, for instance, fluctuation computed along unperturbed particle orbit, validity to first order in magnetic turbulence, small ratio of particle gyroradius to turbulence correlation length, uncoupled wavenumbers of particle power spectrum, with the aim of extending the original theories and investigate the strong turbulence regime. We will also discuss those numerical simulations which can help to address these points. This work will be relevant for the propagation of energetic particles in interplanetary medium, at supernova remnant shocks, in the intergalactic medium.

First meeting: May 13-17 2013


Ballet J.Magnetic turbulence in supernova remnant

Cohen C.SEP observations and implications for particle transport

Fraschetti F.Efficient turbulent amplification of magnetic field driven by dynamo effect at supernova remnant shocks

Giacalone J.The origin of SEPs

Giacalone J.Various topics on particle acceleration at shocks

Schure K.Modelling cosmic ray acceleration in supernova remnants

Zhang M.Applications of stochastic process modeling to particle transport in Space Plasmas

Zhang M.Acceleration of energetic particles by intermittent compressive plasma waves