A Dynamic Ground-Geomagnetic Field Model for the Southern Polar Cap

南极冠的动态地面地磁场模型

• 批准号: 0441074
• 负责人: Dimitrios Vassiliadis
• 金额: $ 14.03万
• 依托单位: Sarissa, Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-15 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0441074&HistoricalAwards=false
• 关键词: Dynamic; Ground; Geomagnetic; Field; Model

This is a proposal to develop a model of the magnetic field variability in the Antarctic region. Over a wide range of time scales (fractions of minutes to days and months) the magnetic field is determined by currents in the magnetosphere and polar ionosphere and responds to changes in the interplanetary medium. Measurements of the field are provided through magnetometers at thirteen locations on the Antarctic, and can be complemented by lower-latitude measurements in the auroral zone. Two types of inputs to the model are the solar wind/IMF parameters, representing the interplanetary state, and the Southern Polar Cap geomagnetic index (PCS), representing the regional magnetospheric state. The first will be used to develop a dynamic model, first in a linear and then a nonlinear implementation. The second will be used to map the effective area of the PCS, and examine the magnetic substructure. Results from these methodologies will be compared against results from the Northern polar cap where we continue to upgrade such modeling and forecasting approaches, in the form of conjugacy studies. Comparisons of the dynamic models in the two polar caps with MHD simulation runs will be undertaken to determine the correspondence of the 3D current structure to its geomagnetic signature on the ground, and improve the interpretation of the latter's spatial and temporal features.Part of the broader impact of this proposal is an improvement to a space weather model being developed for the Northern hemisphere. This is in part a collaboration with the Finnish Meteorological Institute in the context of the Electric Power Research Institute's Sunburst project. In terms of education and knowledge transfer, elements from the model development will be used in lectures and seminars in the Knowledge Transfer group of the Center for Integrated Space Weather Modeling.

这是一项建立南极地区磁场变化模型的提议。在很宽的时间尺度上（几分钟到几天和几个月），磁场由磁层和极地电离层中的电流决定，并对行星际介质的变化做出反应。通过南极13个地点的磁力计提供磁场测量，并可通过极光区低纬度测量加以补充。两种类型的输入模型是太阳风/IMF参数，代表行星际状态，和南极帽地磁指数（PCS），代表区域磁层状态。第一个将用于开发一个动态模型，首先是线性的，然后是非线性的实施。第二个将用于映射PCS的有效区域，并检查磁性子结构。这些方法的结果将与北方极冠的结果进行比较，我们将继续以共轭研究的形式升级这种建模和预测方法。将对两个极冠的动态模型与磁流体动力学模拟运行进行比较，以确定三维电流结构与地面地磁特征的对应关系，并改进对后者的空间和时间特征的解释，这一建议的更广泛影响的一部分是改进正在为北方开发的空间天气模型。这部分是在电力研究所的朝阳项目范围内与芬兰气象研究所合作进行的。在教育和知识转让方面，将在综合空间气象建模中心知识转让小组的讲座和研讨会上使用模型开发的内容。