Buoyant Magnetic Fields in the Sun

这个项目的主题涉及控制太阳内部磁场径向传输的物理过程。太阳的内部通常分为三个主要部分；核心（产生能量的地方）；辐射区和对流区之所以如此称呼，是因为热传递的主要过程。该项目关注的是对流区内的过程，其中对流是最重要的热传输过程。据信，强磁场是在对流带（或速斜）的底部产生的。这些磁场“漂浮”穿过湍流对流区，出现在表面（或光球），被认为是太阳黑子和日冕物质抛射产生的重要因素。这里正在进行的项目将着眼于更好地理解和模拟磁场通过对流区移动的过程。我们试图理解的主要过程被称为磁浮力。磁浮力依赖于太阳内部等离子体的对流。为了模拟对流和磁浮力，我们需要一个考虑密度变化的可压缩模型，因为对流依赖于不同密度的流体包裹，并相应地“浮动”。然而，可压缩流体（存在密度扰动的流体）的另一个特征是声音或声波。这个项目对声波不感兴趣，因为处理声波的计算成本非常高。因此，这个项目要解决的问题之一是找到一个模型，可以模拟没有声波传播的磁浮力——我们称之为隔音模型。目的：*比较不同的隔音模型，并评估它们对磁浮力模型的准确性。*调整现有的模型或创建一个新的模型，以一种不存在声波或影响很小的方式模拟磁浮力

The subject of this project involves the physical processes governing the radial transport of magnetic fields in the solar interior. The interior of the Sun is generally divided into three main sections; the core (where energy is generated);the radiative zone and the convective zone so called because of the primary process by which heat is transferred. This project is concerned with the processes within the convective zone, where convection is the most signicant process of heat transport. It is believed that strong magnetic fields are generated at the base of the convective zone (or the tachocline). These magnetic fields "float" across the turbulent convective zone and appear at the surface (or photosphere) and are thought to be an important factor in the creation of sunspots, and coronal mass ejections. The project being undertaken here will look to better understand and model the process by which the magnetic fields move through the convective zone.The primary process we are trying to understand is called magnetic buoyancy. Magnetic buoyancy relies on the convection of plasma within the Sun. To model convection and hence magnetic buoyancy we need a compressible modelwhich allows for changes in density since convection relies on fluid parcels being of different densities and "floating" accordingly. However, another feature of compressible fluids (fluids in which density perturbations exist) is sound oracoustic waves. Sound waves are not of interest for this project because they are very computationally expensive to deal with. So one of the problems this project will seek to address is to find a model that can model magnetic buoyancywithout sound waves propagating - we call these models sound proof. Aims:* To compare different sound proof models and assess how accurately they model magnetic buoyancy.* Adapt an existing model or create a new model that models magnetic buoyancy in a way where sound waves are absent or of little consequence.1