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收集了Cluster卫星在2001-2005年间观测到的磁尾磁通量绳事件,并对磁通量绳(magnetic flux rope)形成及其内部磁场结构与行星际磁场(IMF)的关系作了统计研究.考虑磁通量绳被观测到时行星际磁场的条件,在所有73个磁通量绳事件中,行星际磁场By分量占有主导地位的事件有80%,且78%的事件具有与行星际磁场By分量相同方向的核心场.行星际磁场通过在磁层顶与地球磁场相互作用改变南北等离子体片内磁场相对方向,形成有利于磁通量绳形成的磁场位形,并且行星际磁场By分量的方向对磁通量绳内部核心场的方向具有决定性影响.从统计结果来看,磁通量绳的形成并不会依赖于行星际磁场Bz分量的方向.
The magnetic tail magnetic flux events observed by Cluster Satellite from 2001 to 2005 were collected and the relationship between the magnetic flux rope formation and the internal magnetic field structure and the interplanetary magnetic field (IMF) was studied. Considering the magnetic flux rope In all 73 magnetic flux rope events, the interplanetary magnetic field By component predominates by 80% and 78% of the events have the same core field as the interplanetary magnetic field By component The interplanetary magnetic field changes the relative magnetic field direction in the north and south plasma plates by interaction with the Earth’s magnetic field at the top of the magnetosphere to form a magnetic field configuration that is conducive to the formation of magnetic flux cords and that the direction of the By component of the interplanetary magnetic field affects the inner core field The direction has a decisive influence.From the statistical results, the formation of flux flux does not depend on the direction of the Bz component of the interplanetary magnetic field.