Ion acceleration at dipolarization fronts in the innermagnetosphere

A. Y. Ukhorskiy; M. I. Sitnov; V. G. MerkinM. GkioulidouD. G. Mitchell

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Ion acceleration at dipolarization fronts in the innermagnetosphere

机译：离子加速在dipolarization方面innermagnetosphere

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During geomagnetic storms plasma pressure in the inner magnetosphere is controlled by energetic ions of tens to hundreds of keV. Plasma pressure is the source of global storm time currents, which control the distribution of magnetic field and couple the inner magnetosphere and the ionosphere. Recent analysis showed that the buildup of hot ion population in the inner magnetosphere largely occurs in the form of localized discrete injections associated with sharp dipolarizations of magnetic field, similar to dipolarization fronts in the magnetotail. Because of significant differences between the ambient magnetic field and the dipolarization front properties in the magnetotail and the inner magnetosphere, the physical mechanisms of ion acceleration at dipolarization fronts in these two regions may also be different. In this paper we discuss a new acceleration mechanism enabled by stable trapping of ions at the azimuthally localized dipolarization fronts. It is shown that trapping can provide a robust mechanism of ion energization in the inner magnetosphere even in the absence of large electric fields.

机译：在磁暴期间等离子体的压力内磁层由能量控制离子的数以百计的凯文。是全球风暴之源电流,控制磁场的分布和几个内磁气圈电离层。内心积聚的热离子人口磁气圈主要发生的形式局部离散注射有关尖锐的dipolarizations磁场,相似在磁尾dipolarization方面。因为之间的显著差异环境磁场和dipolarization前在磁尾和内在属性磁气圈,离子的物理机制加速度在这些dipolarization方面两个地区也可能不同。我们讨论一个新的启用加速机制通过稳定捕获离子的方位本地化dipolarization方面。离子的捕获可以提供一个健壮的机制内磁层即使在通电没有大的电场。

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2017年第3期|3040-3054|共15页
作者
A. Y. Ukhorskiy; M. I. Sitnov; V. G. MerkinM. GkioulidouD. G. Mitchell;
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Applied Physics Laboratory, The Johns Hopkins University, Laurel, Maryland, USA;

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正文语种英语
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关键词
MAGNETOTAIL; acceleration; Ionstrappingacceleration mechanismTAIL IONSmagnetic fieldplasma pressure;

机译：磁尾,加速度;IonstrappingaccelerationmechanismTAIL IONSmagnetic fieldplasma压力;

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Ion acceleration at dipolarization fronts in the innermagnetosphere

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