|
|||||
|
|
Ion dynamics associated with substorm dipolarization fronts |
|
| Authors: | Song Fu Maha Ashour-Abdalla XiaoHua Deng Mostafa El-Alaoui Meng Zhou Robert L Richard Raymond J Walker ZhiGang Yuan |
| Institution: | 1. School of Electronic and Information, Wuhan University, Wuhan, 430072, China 2. Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA, 90095, USA 3. Department of Physics and Astronomy, University of California, Los Angeles, CA, 90095, USA 4. Institute of Space Science and Technology, Nanchang University, Nanchang, 330031, China 5. Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, 90095, USA 6. National Science Foundation, Arlington, Virginia, 22230, USA |
| Abstract: | We report where and how ions are accelerated in the proximity of earthward propagating dipolarization fronts(DFs) in the magnetotail during a magnetospheric substorm on February 15, 2008. Two DFs were observed by multiple THEMIS spacecraft in the near-Earth magnetotail(~?10 Re). We studied the ion dynamics associated with these DFs by comparing observed results with large scale kinetic(LSK) simulation results. The LSK simulation reproduced the sudden ion energy flux enhancement concurrent with the arrival of the DF at the satellite locations. We found that ions can be accelerated to more than 100 keV energy at the DF. These ions were initially non-adiabatically accelerated near magnetic reconnection site and then still non-adiabatically accelerated at the DF structure. |
| Keywords: | dipolarization front particle simulation ion acceleration |
| 本文献已被 CNKI SpringerLink 等数据库收录！ | |