Surface waves above the magnetic poles

磁极上方的表面波

• 批准号: 2614473
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2614473
• 关键词: Surface; waves; above; magnetic; poles

Earth's magnetosphere is a complex and dynamic plasma environment with physical processes that affect our everyday technology. The impulsive events that drive this space weather can excite surface waves akin to the vibrating membrane of a drum at the interface of the solar wind - magnetosphere interaction, a response that was only recently confirmed using observations from several satellites simultaneously. These surface waves should map to magnetic field lines near the poles, directing solar wind energy into the top of the ionosphere. However, the potential ground-based signatures of this process are still not understood since the complicated magnetic geometry in this region pose a challenge to model. The project will use two complementary approaches:- Cutting-edge simulations: Imperial has developed and hosts Gorgon, the UK's only global physics-based simulation of Earth's magnetosphere, which will be used to predict the signatures of surface waves as they approach the magnetic poles.- Novel satellite observations: Using magnetic field measurements over the poles from the miniaturised RadCube CubeSat mission in low Earth orbit, the properties of waves entering the ionosphere will be determined.This will develop our understanding of the fundamental dynamics present in our space environment and how they relate to space weather effects seen on the ground such as the aurorae.

地球的磁层是一个复杂而动态的等离子体环境，其物理过程影响着我们的日常技术。驱动这种空间天气的脉冲事件可以激发表面波，类似于太阳风-磁层相互作用界面处的鼓的振动膜，这种反应直到最近才通过同时使用几颗卫星的观测得到证实。这些表面波应该映射到两极附近的磁场线，将太阳风能量引导到电离层的顶部。然而，这一过程的潜在地基特征仍然不清楚，因为该地区复杂的磁几何形状对建模构成了挑战。该项目将使用两种互补的方法：-尖端模拟：帝国已经开发并主持了Gorgon，这是英国唯一基于物理学的地球磁层模拟，将用于预测表面波接近磁极时的签名。新的卫星观测：将利用低地球轨道RadCube CubeSat使命任务获得的两极磁场测量值，确定进入电离层的波的特性，从而加深我们对空间环境中存在的基本动态及其与极光等地面观测到的空间气象效应之间的关系的理解。