利用多航天器测量对软 X 射线磁鞘发射率进行 4-D 层析的可行性研究

G. Cucho-Padin, Hyunju Connor, Jaewoong Jung, Michael Shoemaker, Kyle Murphy, D. Sibeck, Johannes Norberg, Enrique Rojas
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引用次数: 0

摘要

即将进行的太阳物理学飞行任务利用最先进的宽视场(FOV)成像技术来测量和研究全球范围的空间等离子体环境。在地球上,通过重太阳风离子和外大气层中性原子之间的电荷交换相互作用产生的软 X 射线辐射遥感是研究全球磁鞘结构、其对太阳风条件变化的反应以及日侧磁重联的时空特性的一种很有前途的手段。光学层析成像等数据分析技术可以提供观测目标的额外结构和时变信息,从而提高任务的科学回报。在这项工作中,我们使用位于远距离制高点的软 X 射线成像仪模拟了对日侧磁层的多次同步观测,以使用动态层析方法重建磁鞘随时间变化的三维(3-D)结构。利用 OpenGCCM MHD 模型模拟磁鞘对太阳风条件的时变响应,然后从沿共同轨道分开的多个航天器有利位置生成合成软 X 射线图像。然后进行详细分析,以确定能产生最高保真度磁层切面重建的航天器标称集。这项工作的目的是:(i)首次展示利用动态断层扫描来检索随时间变化的磁鞘结构;(ii)确定以光学断层扫描为目标的多航天器配置的名义飞行任务设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A feasibility study of 4-D tomography of soft X-ray magnetosheath emissivities using multi-spacecraft measurements
Upcoming heliophysics missions utilize state-of-the-art wide field-of-view (FOV) imaging technology to measure and investigate the space plasma environment on a global scale. At Earth, remote sensing of soft X-ray emissions, which are generated via the charge exchange interaction between heavy solar wind ions and exospheric neutral atoms, is a promising means to investigate the global magnetosheath structure, its response to varying solar wind conditions, and the spatiotemporal properties of the dayside magnetic reconnection. Data analysis techniques such as optical tomography can provide additional structural and time-varying information from the observed target and thus enhance the mission’s scientific return. In this work, we simulate multiple and simultaneous observations of the dayside magnetosphere using soft X-ray imagers located at long-distance vantage points to reconstruct the time-dependent, three-dimensional (3-D) structure of the magnetosheath using a dynamic tomographic approach. The OpenGCCM MHD model is used to simulate the time-varying response of the magnetosheath to solar wind conditions and, subsequently, generate synthetic soft X-ray images from multiple spacecraft vantage points separated along a common orbit. A detailed analysis is then performed to identify the nominal set of spacecraft that produces the highest fidelity tomographic reconstruction of the magnetopause. This work aims to (i) demonstrate, for the first time, the use of dynamic tomography to retrieve the time-varying magnetosheath structure and (ii) identify a nominal mission design for multi-spacecraft configurations aiming for optical tomography.
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