首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Soft X-ray and ENA Imaging of the Earth's Dayside Magnetosphere
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Soft X-ray and ENA Imaging of the Earth's Dayside Magnetosphere

机译:软x射线和ENA成像地球的光面的磁气圈

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The LEXI and SMILE missions will provide soft X-ray images of the Earth's magnetosheath and cusps after their anticipated launch in 2023 and 2024, respectively. The IBEX mission showed the potential of an Energetic Neutral Atom (ENA) instrument to image dayside magnetosheath and cusps, albeit over the long hours required to raster an image with a single pixel imager. Thus, it is timely to discuss the two imaging techniques and relevant science topics. We simulate soft X-ray and low-ENA images that might be observed by a virtual spacecraft during two interesting solar wind scenarios: a southward turning of the interplanetary magnetic field and a sudden enhancement of the solar wind dynamic pressure. We employ the OpenGGCM global magnetohydrodynamics model and a simple exospheric neutral density model for these calculations. Both the magnetosheath and the cusps generate strong soft X-rays and ENA signals that can be used to extract the locations and motions of the bow shock and magnetopause. Magnetopause erosion corresponds closely to the enhancement of dayside reconnection rate obtained from the OpenGGCM model, indicating that images can be used to understand global-scale magnetopause reconnection. When dayside imagers are installed with high-ENA innermagnetosphere and FUV/UV aurora imagers, we can trace the solar wind energy flow from the bow shock to the magnetosphere and then to the ionosphere in a self-standing manner without relying upon other observatories. Soft X-ray and/or ENA imagers can also unveil the dayside exosphere density structure and its response to space weather.
机译:莱克斯和微笑任务将提供柔软地球的磁鞘和x射线图像他们的预期在2023年发射后尖点2024年,分别。一个充满活力的中性原子(ENA)的潜力仪表图像的光面磁鞘和尖点,尽管在长时间的要求光栅图像单个像素成像。它是及时讨论两个成像科学技术和相关的话题。模拟软x射线和low-ENA图像在两个被观察到一个虚拟的宇宙飞船有趣的太阳风的场景:一个向南行星际磁场的太阳风的突然增强活力压力。磁流体动力学模型和一个简单的外逸层的中性密度模型计算。尖点产生强大的软x射线和ENA信号可以用来提取位置和运动的弓形激波和磁层。磁层紧密对应侵蚀增强的光面重联率从OpenGGCM模型,表明图像可以用来了解全球范围内吗磁重联。安装与high-ENA innermagnetosphere吗和FUV / UV极光影像,我们可以跟踪太阳风能量流从弓形激波磁气圈然后在电离层而不依赖其他独立的方式天文台。同时公布的光面外逸层密度结构及其对空间天气的回应。

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