Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51b1406s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM51B-1406
Other
2455 Particle Precipitation, 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2774 Radiation Belts, 2790 Substorms
Scientific paper
The Burst Bulk Flows (BBFs) in the high-beta plasma sheet region of the magnetotail have long been studied using both in-situ satellite measurements and polar UV images. But, an integrated view of relations between BBFs and other phenomenon, such as mid-tail reconnection, field aligned current enhancement, ring current and radiation belt particle energization and development of ionospehric current system, still can't be answered clearly from observations. To gain a contextual view of BBFs during substorms, we focus on investigating Burst Bulk Flows (BBF)-related features during a simple substorm triggered by northward to southward IMF turning. The substorm is simulated with Lyon-Fedder-Mobbary (LFM) global MHD model. It is found from the simulation that after the middle tail reconnection, during the dipolarization of magnetic field, BBFs appear at r ~ 20 Re with Vx ~ 400 km/s and flow channel width 2-3 Re. The lifetime of BBFs from simulation is about 10 minutes. All of these simulated features of BBFs match satellite observations. Furthermore, we will show sequences of mid-tail processes, e.g. reconnection, dipolarization, braking of earthward flow, that lead to the development of BBFs. We will also show modeled BBFs-related ionospheric footprints, e.g. evolutions of pseudo-AL index, precipitated electron flux map. Radiation belt particle tracing code and ring current code are used to study the BBFs-related energization and injection of ring current and relativistic particles. This study yields an integrated picture of the different components of the global interaction in the magnetosphere.
Chen Jiahua
Shao Xiaofeng
Sharma Aashish
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