EVIDENCE OF SUPERDIFFUSIVE TRANSPORT OF ELECTRONS ACCELERATED AT INTERPLANETARY SHOCKS

We study the transport properties of energetic electrons accelerated at corotating interaction regions in the solar wind considering the possibility of anomalous diffusion. It is shown that the particle time decay has a power-law behavior when a non-Gaussian propagator, appropriate for superdiffusiv...

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Bibliographic Details
Published in:The Astrophysical journal 2007-12, Vol.671 (2), p.L177-L180
Main Authors: PERRI, S, ZIMBARDO, G
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Online Access:Get full text
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Summary:We study the transport properties of energetic electrons accelerated at corotating interaction regions in the solar wind considering the possibility of anomalous diffusion. It is shown that the particle time decay has a power-law behavior when a non-Gaussian propagator, appropriate for superdiffusive transport, is assumed for particles accelerated at a propagating shock, Looking at shock events detected by the Ulysses spacecraft at 5 AU, we found that 42-290 keV electron time profiles are well fitted by a power law corresponding to superdiffusive transport, i.e., ( Delta x super(2)(l)) alpha [unk], with alpha = 1.02 - 1.38. This implies that particle propagation in the heliosphere can be intermediate between normal diffusion and ballistic motion.
ISSN:0004-637X
1538-4357
DOI:10.1086/525523