Modeling PSBL high speed ion beams observed by Cluster and Double Star |
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Authors: | Maha Ashour-Abdalla Jean-Michel Bosqued Mostafa El-Alaoui Vahé Peroomian Takayuki Umeda Raymond J Walker |
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Institution: | 1. Institute of Geophysics and Planetary Physics, UCLA, Los Angeles, CA 90095-1567, USA;2. Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095-1567, USA;3. Centre d’Etude Spatiale des Rayonnements, CNRS, Toulouse Cedex 4, France;4. Geospace Research Center, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601, Japan;5. Department of Earth and Space Sciences, UCLA, Los Angeles, CA 90095-1567, USA |
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Abstract: | On October 8, 2004, the Cluster and Double Star spacecraft crossed the near-Earth (12–19 RE) magnetotail neutral sheet during the recovery phase of a small, isolated substorm. Although they were separated in distance by ∼7 RE and in time by ∼30 min, both Cluster and Double Star observed steady, but highly structured Earthward moving >1000 km/s high speed H+ beams in the PSBL. This paper utilizes a global magnetohydrodynamic (MHD) simulation driven by Wind spacecraft solar wind input to model the large-scale structure of the PSBL and large-scale kinetic (LSK) particle tracing calculations to investigate the similarities and differences in the properties of the observed beams. This study finds that the large-scale shape of the PSBL is determined by the MHD configuration. On smaller scales, the LSK calculations, in good qualitative agreement with both Cluster and Double Star observations, demonstrated that the PSBL is highly structured in both time and space, on time intervals of less than 2 min, and spatial distances of the order of 0.2–0.5 RE. This picture of the PSBL is different from the ordered and structured region previously reported in observations. |
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Keywords: | Magnetosphere Plasma sheet boundary layer Ion beams Non-adiabatic acceleration Global MHD simulations |
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