Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1766390 | Advances in Space Research | 2008 | 13 Pages |
Abstract
On October 8, 2004, the Cluster and Double Star spacecraft crossed the near-Earth (12-19Â RE) magnetotail neutral sheet during the recovery phase of a small, isolated substorm. Although they were separated in distance by â¼7Â RE and in time by â¼30Â min, both Cluster and Double Star observed steady, but highly structured Earthward moving >1000Â 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 2Â min, and spatial distances of the order of 0.2-0.5Â RE. This picture of the PSBL is different from the ordered and structured region previously reported in observations.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
Maha Ashour-Abdalla, Jean-Michel Bosqued, Mostafa El-Alaoui, Vahé Peroomian, Takayuki Umeda, Raymond J. Walker,