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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >The Effect of Storm Driver and Intensity on Magnetospheric Ion Temperatures
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The Effect of Storm Driver and Intensity on Magnetospheric Ion Temperatures

机译：风暴司机和强度的影响磁性层的离子温度

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Energy deposited in the magnetosphere during geomagnetic storms drives ion heating and convection. Ions are also heated and transported via internal processes throughout the magnetosphere. Injection of the plasma sheet ions to the inner magnetosphere drives the ring current and, thus, the storm intensity. Understanding the ion dynamics is important to improving our ability to predict storm evolution. In this study, we perform superposed epoch analyses of ion temperatures during storms, comparing ion temperature evolution by storm driver and storm intensity. The ion temperatures are calculated using energetic neutral atom measurements from the Two Wide-Angle Imaging Neutral-Atom Spectrometers (TWINS) mission. The global view of these measurements provide both spatial and temporal information. We find that storms driven by coronal mass ejections (CMEs) tend to have higher ion temperatures throughout the main phase than storms driven by corotating interaction regions (CIRs) but that the temperatures increase during the recovery phase of CIR-driven storms. Ion temperatures during intense CME-driven storms have brief intervals of higher ion temperatures than those during moderate CME-driven storms but have otherwise comparable ion temperatures. The highest temperatures during CIR-driven storms are centered at 18 magnetic local time and occur on the dayside for moderate CME-driven storms. During the second half of the main phase, ion temperatures tend to decrease in the postmidnight to dawn sector for CIR storms, but an increase is observed for CME storms. This increase begins with a sharp peak in ion temperatures for intense CME storms, likely a signature of substorm activity that drives the increased ring current.
机译：能量沉积在磁气圈驱动离子加热和地磁风暴对流。通过内部流程在整个磁气圈。内磁气圈驱动环当前,因此风暴强度。了解离子动力学是很重要的提高我们预测风暴进化的能力。在这项研究中,我们进行叠加的时代分析离子温度在风暴期间,比较离子温度演化的风暴司机和风暴强度。计算使用高能中性原子从两个广角成像测量中性原子光谱仪(双胞胎)的使命。这些测量提供的全局视图空间和时间信息。风暴由日冕物质抛射(cme)往往有较高的离子温度比风暴由共转的主要阶段互动区域(cir)但这在经济复苏阶段的温度增加CIR-driven风暴。强烈的CME-driven风暴有短暂的时间间隔比在较高的离子温度温和CME-driven风暴却不然类似的离子温度。温度在CIR-driven风暴集中在当地时间18磁和发生温和的的光面CME-driven风暴。在下半年的主要阶段,离子postmidnight温度会降低黎明部门CIR风暴,但增加观察CME风暴。用一把锋利的峰值为强烈的离子温度CME风暴,可能一个签名的亚暴活动,推动环电流增加。

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