CEDAR: Interhemispheric High Latitude Ionospheric Electrodynamics Using a Coordinated Analysis of AMISR, Sondrestrom, SuperDARN and Other Data Sets

CEDAR：使用 AMISR、Sondrestrom、SuperDARN 和其他数据集的协调分析进行半球间高纬度电离层电动力学

• 批准号: 0728538
• 负责人: Calvin Robert Clauer
• 金额: $ 35.94万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-03-10 至 2010-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0728538&HistoricalAwards=false
• 关键词: CEDAR; Interhemispheric; Latitude; Ionospheric; Electrodynamics

The investigators will examine the simultaneous development of the transpolar ionospheric electric potential distribution in both northern winter / southern summer, northern summer / southern winter, and equinox conditions. The purpose of this examination will be to answer questions regarding: (1) the simultaneous assymetrical summer/winter development of transpolar potential saturation during strong solar wind driving, when the interplanetary magnetic field is strongly southward, (2) the simultaneous development of reversed electric potential cells in both hemispheres in response to northward interplanetary magnetic field and to determine if there is a similar saturation of the reverse potential cells during periods when the interplanetary magnetic field is strongly northward, and (3) to elucidate the simultaneous electrodynamic response of both hemispheric electric potential patterns in response to solar wind shock waves. Two types of response to solar wind shocks have been identified, the so-called typical response and the atypical response. Examination of the global ionospheric electrodynamics will be undertaken to confirm the hypothesis of the field-aligned electric current distribution that forms to produce the atypical response. The measurements to accomplish these goals will be acquired from the SuperDARN HF radar data base for both hemispheres, augmented by incoherent scatter radar ionospheric drift measurements, DMSP polar satellite ionospheric drift data, and measurements from arrays of high latitude magnetometers. These measurements will be inverted to obtain polar electric potential patterns using the Assimilative Mapping of Electrodynamics procedure. A measurement program using the new AMISR radars in Poker Flat, Alaska and Resolute Canada together with the Sondrestrom radar will enable significant improvement in the specification of the northern potential pattern. A significant aspect of the project will be the training of a graduate student in the measurement and analysis techniques that utilize upper atmospheric radars. The project will accumulate data and understanding that can be utilized to validate various global models and specifically magnetohydrodynamic simulation models of the global, coupled thermosphere - ionosphere - magnetosphere - solar wind system.

调查人员将研究跨极电离层电势分布在北方冬季/南方夏季、北方夏季/南方冬季和春分条件下的同时发展。本次考试的目的是回答以下问题：（1）在强太阳风驱动期间，当行星际磁场强南向时，跨极位饱和的夏/冬同步发展，（二）同时发展的反向电位细胞在两个半球，以响应向北行星际磁场，并确定是否有一个类似的饱和，行星际磁场强北向期间的反向电势电池;（3）阐明两半球电势模式对太阳风冲击波的同步电动力学响应。对太阳风冲击的反应有两种，即所谓的典型反应和非典型反应。将对全球电离层电动力学进行研究，以证实为产生非典型响应而形成的场向电流分布的假设。为实现这些目标，将从两个半球的SuperDARN高频雷达数据库中获取测量数据，并通过非相干散射雷达电离层漂移测量数据、DMSP极地卫星电离层漂移数据和高纬度磁力计阵列的测量数据加以补充。这些测量将被反转，以获得极电位模式使用电动力学的同化映射程序。在阿拉斯加的扑克平原和加拿大的Resolute使用新的AMISR雷达以及Sondrestrom雷达的测量计划将大大改善北方潜在模式的规格。该项目的一个重要方面将是培训一名研究生掌握利用高层大气雷达的测量和分析技术。该项目将积累可用于验证各种全球模型，特别是全球热层-电离层-磁层-太阳风耦合系统的磁流体动力学模拟模型的数据和认识。