Sign for Super-diffusive Transport of Energetic Ions Associated with a Coronal-mass-ejection-driven Interplanetary Shock

Details Sign for Super-diffusive Transport of Energetic Ions Associated with a Coronal-mass-ejection-driven Interplanetary Shock Sign for Super-diffusive Transport of Energetic Ions Associated with a Coronal-mass-ejection-driven Interplanetary Shock

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...731l..34s&link_type=abstract

The Astrophysical Journal Letters, Volume 731, Issue 2, article id. L34 (2011).

Astronomy and Astrophysics

Astronomy

1

Acceleration Of Particles, Diffusion, Shock Waves

Scientific paper

We study the transport properties of energetic particles in the upstream region of an interplanetary shock, considering the possibility of anomalous diffusion. We investigated the energetic storm particle event on 2006 December 14 observed by the ACE spacecraft at 1 AU. The spatial decay profile of the energetic particle flux does not exhibit an exponential behavior, as expected for the standard diffusive shock acceleration process, but a power-law behavior in anomalous or super-diffusive transport. The spatial profiles of the energetic ions with energy ranges of 0.546-0.761, 0.761-1.22, and 1.22-4.97 MeV are well fitted by a power-law distribution; we observe the relation langΔx 2rang vprop t α for α~ 1.28-1.33, where Δx is the particle displacement within the timescale t, and the bracket denotes an ensemble average. This implies that particle propagation around a near-Earth orbit can be intermediate between normal diffusion (α = 1) and ballistic motion (α = 2), even though the power of the electromagnetic wave is sufficiently large to scatter the particles, and that an entirely different wave-particle interaction process based on linear or quasi-linear theories is responsible for the ion motion upstream of an interplanetary shock observed around the Earth's orbit.

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