Rice Convection Model simulation of the substorm-associated injection of an observed bubble into the inner magnetosphere: 1. Magnetic field and other inputs
Rice Convection Model simulation of the substorm-associated injection of an observed bubble into the inner magnetosphere: 1. Magnetic field and other inputs
复制标题
DOI：
10.1029/2009ja014130
复制
发表时间：
2009-08
影响因子：
--
通讯作者：
Jichun Zhang;R. Wolf;G. Erickson;R. Spiro;F. Toffoletto;J. Yang
中科院分区：
文献类型：
--
作者：
Jichun Zhang;R. Wolf;G. Erickson;R. Spiro;F. Toffoletto;J. Yang
[1]这项工作的目标是一个现实的赖斯对流模型（RCM）模拟的适度亚暴发生在1998年7月22日，并观察到的Geotail航天器在内部等离子体片。它代表了第一次的RCM已被用于详细建模的内磁层事件使用的数据从一个航天器在地球同步轨道以外的内部等离子体片驱动模型的时间相关的边界条件。由于这是一个重大的偏离过去的做法，我们在本文中，详细介绍了如何确定模型的输入。一份随附的文件介绍了结果和解释。调整模型输入，以实现RCM计算值与Geotail测量值之间的近似一致性，Geotail位于XGSM = −9 RE，YGSM = 0附近的RCM建模区域内。为了表示生长阶段的磁场，我们利用Tsyganenko（1989）统计磁场模型，调整以符合Geotail测量的压力和磁场，以一种新的方式使用线性Grad-Shafranov方程的解析解。在膨胀阶段的磁场表示通过添加一个亚暴电流楔使用公式开发的Tsyganenko。感应电场在这些模拟中起着核心作用，因为它们在亚暴注入区域附近很大。我们提供了一个详细的描述如何感应电场包括在RCM以及处方的电磁规范中使用的条件。
[1] The objective of this work is a realistic Rice Convection Model (RCM) simulation of a modest substorm that occurred on 22 July 1998 and was observed by the Geotail spacecraft in the inner plasma sheet. It represents the first time the RCM has been used for detailed modeling of an inner magnetospheric event using data from a spacecraft in the inner plasma sheet beyond geosynchronous orbit to drive the model's time-dependent boundary conditions. Since this represents a substantial departure from past practice, we present, in this paper, a detailed account of how model inputs are determined. An accompanying paper presents results and interpretations. Model inputs are adjusted to achieve approximate consistency between RCM-computed values and measurements by Geotail, which was within the RCM modeling region near XGSM = −9 RE, YGSM = 0. To represent the magnetic field in the growth phase, we utilize a Tsyganenko (1989) statistical magnetic field model, adjusted to agree with Geotail-measured pressure and magnetic field in a new way using analytic solutions to the linear Grad-Shafranov equation. The magnetic field during the expansion phase is represented by adding a substorm current wedge using formulas developed by Tsyganenko. Induction electric fields play a central role in these simulations, because they are large in the vicinity of the substorm injection region. We provide a detailed description of how induction electric fields are included in the RCM as well as a prescription of the electromagnetic gauge condition used in the code.