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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Messenger observations of dipolarization events in Mercury's magnetotail
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Messenger observations of dipolarization events in Mercury's magnetotail

机译:信使dipolarization事件的观察水星的磁尾

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Several series of large dipolarization events are documented from magnetic field observations in Mercury's magnetotail made by the MESSENGER spacecraft. The dipolarizations are identified by a rapid (~1 s) increase in the northward component of the magnetic field, followed by a slower return (~10 s) to pre-onset values. The changes in field strength during an event frequently reach 40 nT or higher, equivalent to an increase in the total magnetic field magnitude by a factor of ~4 or more. The presence of spatially constrained dipolarizations at Mercury provides a key to understanding the magnetic substorm process in a new parameter regime: the dipolarization timescale, which is shorter than at Earth, is suspected to lead to efficient non-adiabatic heating of the plasma sheet proton population, and the high recurrence rate of the structures is similar to that frequently observed for flux ropes and traveling compression regions in Mercury's magnetotail. The relatively short lifetime of the events is attributed to the lack of steady field-aligned current systems at Mercury.
机译:几个系列的大型dipolarization事件从磁场观测记录水星的磁尾的信使宇宙飞船。迅速向北(~ 1 s)增加组件的磁场,紧随其后的是一个慢(~ 10 s)回到pre-onset值。磁场强度的变化在一个事件经常达到40元或更高,相当于总磁场强度的增加~ 4倍或更多。空间限制dipolarizations汞提供了一个理解磁的关键亚暴过程在一个新的参数政权:dipolarization时间表,短于在地球上,被怀疑导致效率非绝热加热等离子体的单质子人口,和高复发率结构类似于经常观察到通量绳和压缩区域旅行在水星的磁尾。一生的事件归因于缺乏稳定的field-aligned当前系统汞。

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