Geospace Environment Modeling 2008–2009 Challenge: Geosynchronous magnetic field
Geospace Environment Modeling 2008–2009 Challenge: Geosynchronous magnetic field
复制标题
地球空间环境建模 2008–2009 挑战：地球同步磁场
DOI：
10.1029/2010sw000617
复制
发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
H. Singer
中科院分区：
文献类型：
--
作者：
L. Rastätter;M. Kuznetsova;A. Vapirev;A. Ridley;M. Wiltberger;A. Pulkkinen;M. Hesse;H. Singer
本文报道了2008-2009年GEM地球物理挑战赛的内磁层磁场部分基于度规的结果。该挑战要求建模者提交四个地磁风暴事件的结果和五种不同类型的观测结果，这些观测结果可以通过统计或气候学或物理学（例如，磁层-电离层系统的MHD模型。我们提出了12个模型设置，在社区协调建模中心和在这些事件的各种建模机构运行的结果。为了测量每个模型相对于观测的性能，我们使用测量的磁场强度（B）、仰角的正弦Θxz（τ）和两个量的波动的谱功率之间的直接比较。我们发现，模型的排名有很大的不同类型的变量和技能得分使用。没有一个模型对所有事件都表现得最好。我们发现经验模型对弱风暴事件表现良好，基于物理的（磁流体动力学）模型对强风暴事件更好。在同一模型的一系列运行中，我们发现，更高的分辨率可能并不总是改善结果，除非更多的物理内磁层，如环电流的动力学描述，包括在内。
In this paper the metrics‐based results of the inner magnetospheric magnetic field part of the 2008–2009 GEM Metrics Challenge are reported. The Metrics Challenge asked modelers to submit results for four geomagnetic storm events and five different types of observations that can be modeled by statistical or climatological or physics‐based (e.g., MHD) models of the magnetosphere‐ionosphere system. We present the results of 12 model settings that were run at the Community Coordinated Modeling Center and at the institutions of various modelers for these events. To measure the performance of each of the models against the observations, we use direct comparisons between the strength of the measured magnetic field (B), the sine of the elevation angle Θxz (τ), and the spectral power of fluctuations for both quantities. We find that model rankings vary widely by type of variable and skill score used. None of the models consistently performs best for all events. We find that empirical models perform well for weak storm events, and physics‐based (magnetohydrodynamic) models are better for strong storm events. Within a series of runs of the same model we find that higher resolution may not always improve results unless more physics of the inner magnetosphere, such as the kinetic description of the ring current, is included.