Walen and Slow-mode Shock Analyses Applied to fast Flows in the Near-Earth Magnetotail By Cluster and Geotail
作者单位：Space Research Institute Austrian Academy of Sciences A-8042 Graz Austria Research Institute for Sustainable Humanosphere Kyoto University Uji Kyoto 611 -0011 Japan Space Research Institute Austrian Academy of Sciences A-8042 Graz Austria Research Institute for Sustainable Humanosphere Kyoto University Uji Kyoto 611 -0011 Japan The Blackett Laboratory Imperial College Prince Consort Road London SW7 2BZ United Kingdom Centre d’Etude Spatiale des Rayonnements F-31028 Toulouse Cedex 4 France
会议名称：《第十一届全国日地空间物理学术讨论会》
会议日期：2005年
学科分类：070802[理学-空间物理学] 07[理学] 0708[理学-地球物理学]
摘 要：正Slow shocks are a key component in theories of reconnection. We show an example of a slow shock in the Cluster dataset, observed in the magnetotail in the vicinity of the tail current sheet with flow direction reverse from earthward to tailward or versa. Here we analyze several such events using Cluster observations from the near-Earth magnetotail. Multi-spacecraft analysis is applied to the observations, leading to a better estimate of the shock normal orientation;normal inflow and outflow speeds are calculated. Initial results suggest that taiward flows are accelerated across Petschek-type slow-mode shocks based on the Rankine-Hugoniot shock jump conditions and the Walen relation. Eartward flows, however, tend to fail these tests. A possible explanation may be the obstacle posed by the higher magnetic field pressure of the inner magnetosphere.