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Particle trapping at a tangential discontinuity: Multiple incidence |
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| Authors: | Rudolf A Treumann and Wolfgang Baumjohann |
| Institution: | Max-Planck-Institut für Physik und Astrophysik, Institut für extraterrestrische Physik, D-8046, Garching, F.R.G. |
| Abstract: | Particle trapping by tangential gradients at the magnetopause is investigated for the case of a tangential discontinuity and taking into account an external magnetosheath magnetic field. Such a field causes a deflection of the reflected particle back to the magnetopause and thus enhances the chances of the particle to be captured by the magnetosphere after having travelled a certain finite distance down the magnetopause. The trapping angle and distances are calculated. Assuming a drifting Maxwellian for the magnetosheath plasma, we estimate that about 5% of that part of the magnetosheath plasma which comes into contact with the magnetopause can enter the dayside magnetopause during the first encounter. After multiple gyrations, about 30% of these particles may be trapped in the magnetosphere. |
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