Collaborative Research: Substorm and Storm Injection Studies Using a Coupled Global MHD - RCM Model

研究人员将研究在磁层亚暴和磁暴期间等离子体注入内磁层的物理学。 该项目将使用一个新的耦合模型，包括加州大学洛杉矶分校的全球磁流体动力学（MHD）模型和水稻对流模型（RCM）。 耦合模型将消除的缺点，目前固有的模型：缺乏一个环电流和正确的粒子漂移物理的MHD代码，以及依赖经验的子模型和特设的假设的RCM。 耦合过程将通过使用一种新的数据结构来完成，以便在计算期间的某些时间在模型之间交换信息，从而允许模型并行运行，而不一定在同一台计算机上。 数据交换将采用协议的形式，类似于万维网上使用的协议，这将允许最大限度的灵活性、可扩展性和开放性。 模型的耦合将分六个阶段进行，这些阶段的复杂性不断增加。 随着每个耦合阶段的完成，研究人员将模拟一组选定的亚暴和风暴事件，并与现场观测进行全面比较。 比较将产生关于不同过程的相对重要性的信息。其目标是开发一个全球磁层模型，与当代模型相比，该模型具有更高的能力，并且对亚暴和风暴时间注入有更深入的了解。

The investigators will study the physics of plasma injections into the inner magnetosphere during magnetospheric substorms and storms. The project will use a newly coupled model consisting of the UCLA global magnetohydrodynamic (MHD) model and the Rice Convection Model (RCM). The coupled model will eliminate the shortcomings that are currently inherent to the models: the lack of a ring current and correct particle drift physics in the MHD code, and the dependence of the RCM on empirical submodels and ad hoc assumptions. The coupling process will be done by using a novel data structure to exchange information between the models at certain times during the calculation, allowing the models to run in parallel, and not necessarily on the same computer. The data exchange will be in the form of a protocol, similar to the protocols that are used on the World Wide Web, which will allow for maximum flexibility, extensibility and openness. Coupling of the models will proceed in six stages of increasing complexity. As each coupling stage is completed the investigators will model a set of selected substorm and storm events and perform comprehensive comparisons with in situ observations. The comparisons will yield information about the relative importance of different processes. The goal is to develop a global magnetosphere model with much improved capabilities compared to contemporary models, and a much more thorough understanding of substorm and storm time injections.