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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A Multi-Instrument Study of a Dipolarization Event in the Inner Magnetosphere
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A Multi-Instrument Study of a Dipolarization Event in the Inner Magnetosphere

机译:Multi-Instrument Dipolarization事件的研究在磁层内部

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摘要

A dipolarization of the background magnetic field was observed during a conjunction of the Magnetospheric Multiscale (MMS) spacecraft and Van Allen Probe B on September 22, 2018. The spacecraft were located in the inner magnetosphere at L ~ 6-7 just before midnight magnetic local time (MLT). The radial separation between MMS and Probe B was ~1R_E. Gradual dipolarization or an increase of the northward component BZ of the background field occurred on a timescale of minutes. Exploration of energization and Radiation in Geospace located 0.5 MLT eastward at a similar L shell also measured a gradual increase. The spatial scale was of the order of 1 R_E. On top of that, MMS and Probe B measured BZ increases, and a decrease in one case, on a timescale of seconds, accompanied by large electric fields with amplitudes > several tens of mV/m. Spatial scale lengths were of the order of the ion inertial length and the ion gyroradius. The inertial term in the momentum equation and the Hall term in the generalized Ohm's law were sometimes non-negligible. These small-scale variations are discussed in terms of the ballooning/interchange instability and kinetic Alfvén waves among others. It is inferred that physics of multiple scales was involved in the dynamics of this dipolarization event.
机译:的dipolarization背景磁场观察在一起的吗磁性层的多尺度(MMS)航天器和范艾伦辐射探测器B 9月22日,2018年。宇宙飞船是位于内磁气圈在L ~ 6 - 7只在午夜之前磁(MLT)当地时间。在MMS和探测器B ~ 1 r_e之间。向北dipolarization或增加发生在组件热晕的背景字段分钟的时间表。激发和辐射在地球空间位置0.5 MLT向东类似L壳测量逐渐增加。1 R_E的顺序。和探测器B测量热增加,减少在一个案例中,在几秒钟的时间尺度上,伴随着大电场振幅>成千的mV / m。长度是离子惯性的顺序长度和离子回转半径。动量方程和大厅内广义欧姆定律是有时可观的。讨论了用膨胀/交换不稳定和动力学阿尔芬波别人。尺度是参与的动力dipolarization事件。

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