Quantifying the Importance of an L5 Magnetograph

目前，人们只能在太阳和地球的连线上观测到太阳。这个观点被称为L1观点，意味着我们对太阳上出现的活跃区域的观测有限，由于预测火山爆发和破坏性太空天气的数据有限。为了解决这个问题，一项新的太空任务已经被提议在距地球600度的L5点放置一颗卫星。这颗卫星将对太阳上产生的空间天气现象提供预警。为了考虑放置在L5点的磁力计将如何改善空间天气预报，将对2年、11年太阳周期内的太阳全球磁场进行一系列3D非潜在数值模拟。通过使用一个被称为参考Sun模拟的严格约束的数据集，我们将确定当包含L1 + L5的数据时，与只包含L1的数据相比，模拟的准确性有多高。除此之外，还将确定考虑在L4（地球前方600度）放置第二颗卫星的改进。改进将通过考虑(a)表面磁通的准确性，(b)总磁能和自由磁能，(c)开放磁通，最后(d)磁通绳的形成和喷发时间来量化。

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.