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Title: Temporary topological trapping and escape of charged particles in a flux tube as a cause of delay in time asymptotic transport
Authors: Paisan Tooprakai
Paeng Chuychai
J. Minnie
David Ruffolo
John W. Bieber
Chulalongkorn University
Bartol Research Institute
Mahidol University
Keywords: Earth and Planetary Sciences
Issue Date: 16-Sep-2007
Citation: Geophysical Research Letters. Vol.34, No.17 (2007)
Abstract: The scenario of temporary trapping of magnetic field lines and their subsequent suppressed diffusive escape from topological magnetic structures embedded in turbulence has been offered as a way to understand the persistence of "dropouts", or sharp gradients in observed heliospheric energetic particle intensities. Here a set of numerical experiments is carried out to show the basic physics of this process: charged test particles can be temporarily trapped in flux tubes and then escape due to random turbulent perturbations in the magnetic field. The overall effect is a delay in the onset of time-asymptotic transport. We thus confirm that previous arguments based on field line transport are also applicable to test particle transport. Copyright 2007 by the American Geophysical Union.
ISSN: 00948276
Appears in Collections:Scopus 2006-2010

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