Quantifying the Importance of an L5 Magnetograph

量化 L5 磁仪的重要性

• 批准号: 2434982
• 金额: --
• 依托单位: University of St Andrews
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2434982
• 关键词: Quantifying; Importance; L5; Magnetograph

Currently the Sun may only be observed along the line joining the Sun and Earth. This viewpoint called the L1 viewpoint means that we have limited observations of active region that emerge on the Sun and due to this limited data for predicting when eruptions and disruptive Space Weather will occur. To counter this a new space mission has been proposed to place a satellite at the L5 point which lies 60o behind the Earth. This satellite will provide advance warning of Space Weather producing phenomena on the Sun. To consider how a magnetograph placed at the L5 point will improve Space Weather predictions a series of 3D non-potential numerical simulations of the Sun's global magnetic field over two , eleven year solar cycles will be carried out. By using a carefully constrained data set called the reference Sun simulation, we will determine how more accurate the simulations become when data from both L1 + L5 is included compared to just L1. In addition to this the improvements from considering a second satellite placed at L4 (60o in front of Earth) will be determined. The improvements will be quantified by considering (a) the accuracy of the surface flux, (b) the total and free magnetic energy, (c) the open flux and finally (d) the time of formation and eruption of magnetic flux ropes.

目前，太阳只能沿着太阳和地球的连接线被观测到。这种被称为L1视点的观点意味着我们对太阳上出现的活动区的观测有限，并且由于这种有限的数据来预测何时会发生喷发和破坏性的空间天气。为了应对这种情况，一项新的太空任务已经被提出，将一颗卫星放置在地球后方60度的L5点。这颗卫星将对空间天气在太阳上产生的现象提供预警。为了考虑放置在L5点的磁强计将如何改进空间天气预报，将对两个或十一个太阳周期内的太阳全球磁场进行一系列3D非势场数值模拟。通过使用一个被称为参考太阳模拟的仔细约束的数据集，我们将确定当包括来自L1+L5的数据时，与仅包括L1相比，模拟变得多精确。除此之外，将确定考虑将第二颗卫星放置在L4(距离地球60度)所带来的改进。这些改进将通过考虑(A)表面通量的准确性、(B)总磁能和自由磁能、(C)开放通量以及(D)磁通绳的形成和喷发时间来量化。