Satellite Magnetic Fields Data Analysis: Magnetospheric/Ionospheric Currents and Waves

卫星磁场数据分析：磁层/电离层电流和波

• 批准号: 9500244
• 负责人: Robert Erlandson
• 金额: $ 43.5万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-01 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9500244&HistoricalAwards=false
• 关键词: Satellite; Magnetic; Fields; Data; Analysis

This proposal is a request for the continuation of NSF support for analysis of magnetic field observations acquired by APL-developed satellite experiments. The proposed research will make substantial contributions to NSF initiatives such as GEM, CEDAR, and Space Weather. Satellite magnetic field data from Freja and Viking, HILAT, DMSP-F7, TRIAD, AMPTE/CCE, MAGSAT, and UARS will be used in studies of large and small scale current systems and magnetic wave phenomena associated with the magnetospheric boundaries and current source regions. The intent is also to disseminate data and information by way of scientific journal publications, presentations, and collaborative efforts with individual scientists and agency programs. The proposal includes the Freja data processing and analysis effort. The following areas will be investigated: (1) Multiple data sets will be used to characterize the distribution and source regions of the large scale currents and their variation with the phase of geomagnetic storms, including theoretical investigation of the current disruption process. (2) Identify and analyze simultaneous observations of large scale currents to thoroughly characterize the local time and altitude structure of the current systems. (3) Conduct pilot studies of Poynting flux using the Freja electric and magnetic field data, concentrating on small and intermediate scales. (4) Investigate the detailed correlation of magnetic fluctuations with field aligned currents and particle precipitation regions to put the use of AC Fluctuations on a firm scientific footing. (5) Refine empirical models of the auroral oval shape and size to allow a more reliable extrapolation of the auroral position in local time. This will involve inter-comparison of real-time predicted auroral dynamics with Geomagnetic Induced Currents to quantitatively test the model and forecasting system. (6) The usefulness of the Freja data and its importance to other programs motivates the developme nt of an efficient means of rapidly disseminating these data to the scientific community. (7) Continue studies of wave phenomena. Freja data cover a previously unexplored frequency range, and the availability of simultaneous electric field and high time resolution 3-D particle measurements assures that study of these phenomena will yield important results concerning the dynamics of the Birkeland current flow regions. Also pursued, will be the fluctuations inherent to the magnetopause current layer paying particular attention to the correlation of these fluctuations with theoretical predictions of current layer turbulence.

这项建议要求国家科学基金会继续支持分析杀伤人员地雷开发的卫星实验所获得的磁场观测结果。 拟议的研究将为NSF的GEM、CEDAR和空间天气等计划做出重大贡献。 来自Freja和维京海盗、HILAT、DMSP-F7、TRIAD、AMPTE/CCE、MAGSAT和UARS的卫星磁场数据将用于研究大小尺度电流系统以及与磁层边界和电流源区域有关的磁波现象。 其目的还在于通过科学期刊出版物、演示文稿以及与科学家个人和机构方案的合作努力来传播数据和信息。 该提案包括Freja数据处理和分析工作。 主要研究内容包括：（1）利用多个观测资料研究大尺度电流的分布、源区及其随磁暴位相的变化，包括电流扰动过程的理论研究。 (2)识别和分析大尺度海流的同步观测，以彻底表征海流系统的当地时间和高度结构。 (3)利用Freja的电场和磁场数据对坡印廷通量进行试点研究，重点是小规模和中等规模。 (4)研究磁场波动与场向电流和粒子沉淀区域之间的详细相关性，为交流波动的使用奠定坚实的科学基础。 (5)改进极光椭圆形状和大小的经验模型，以便更可靠地推断极光在当地时间的位置。 这将涉及实时预测的极光动态与地磁感应电流的相互比较，以定量测试模型和预测系统。 (6)Freja数据的有用性及其对其他计划的重要性促使开发一种有效的方法，将这些数据快速传播给科学界。 (7)继续研究波动现象。 Freja的数据涵盖了以前未探索的频率范围内，同时电场和高时间分辨率的3-D粒子测量的可用性保证了这些现象的研究将产生重要的结果，关于动力学的Birkeland电流流动区域。 还追求，将是固有的波动的磁层顶电流层特别注意这些波动与理论预测的电流层湍流的相关性。