HR: 0830h
AN: SH21B-0137    [PDF]
TI: Spatial Intensity Gradients of Impulsive Particle Events and Supradiffusive Magnetic Fields
AU: * Ragot, B
EM: bragot@astro.as.utexas.edu
AF: Department of Astronomy, University of Texas, Austin, TX 78712 United States
AU: Kahler, S
EM: stephen.kahler@hanscom.af.mil
AF: Space Vehicles Directorate, Air Force Research Laboratory, 29 Randolph Road, Hanscom AFB, MA 01731 United States
AB: The low-energy ion intensity profiles of impulsive solar energetic particle (SEP) events display both sharp ($< 2.5$ min) local gradients and larger scale ($\approx 1-6$ hour) dropouts, indicative of fast cross-field transport on the larger scales in spite of restricted short-scale transport. Rapid variations and modulations within the few-hour long channels of enhanced intensity are also observed. We show that the sharp gradients observed in the intensity profiles of impulsive particle events exist only because of the very strong supradiffusion of the field lines on the short and medium scales, due to the steep spectrum of magnetic turbulence measured on these scales. We also argue that these intermediate scales of magnetic turbulence may produce the substructures observed by Mazur et al. (2000) within the larger channels.
DE: 7524 Magnetic fields
DE: 7859 Transport processes
DE: 7863 Turbulence
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting