Temporary topological trapping and escape of charged particles in a flux tube as a cause of delay in time asymptotic transport
Article first published online: 14 SEP 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 17, September 2007
How to Cite
2007), Temporary topological trapping and escape of charged particles in a flux tube as a cause of delay in time asymptotic transport, Geophys. Res. Lett., 34, L17105, doi:10.1029/2007GL030672., , , , , and (
- Issue published online: 14 SEP 2007
- Article first published online: 14 SEP 2007
- Manuscript Accepted: 8 AUG 2007
- Manuscript Revised: 20 JUL 2007
- Manuscript Received: 11 MAY 2007
- interplanetary magnetic fields;
- energetic particles;
- magnetic turbulence
 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.