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

研究人员将研究在北部冬季/南部夏季、北部夏季/南部冬季和春分条件下跨极电离层电势分布的同步发展。本次考试的目的是回答以下问题：(1)在强太阳风驱动下，当行星际磁场强烈向南时，跨极电位饱和的夏/冬同步非对称发展；(2)响应向北的行星际磁场，在两个半球同时发展反向电位细胞，以确定在行星际磁场强烈向北时，是否存在类似的反向电位细胞饱和；(3)阐明太阳风激波对两个半球电位模式的同步电动力响应。对太阳风冲击的两种响应已被确定，即所谓的典型响应和非典型响应。将对全球电离层电动力学进行检查，以确认产生非典型响应的场向电流分布的假设。实现这些目标的测量数据将从两个半球的SuperDARN高频雷达数据库获取，并通过非相干散射雷达电离层漂移测量、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进行增强。这些测量将被倒置，以获得极性电位模式使用电动力学过程的同化映射。在阿拉斯加的Poker Flat、Resolute和加拿大的Sondrestrom雷达上使用新的AMISR雷达的测量项目将显著改善北部潜在模式的规格。该项目的一个重要方面是训练一名研究生掌握利用高层大气雷达的测量和分析技术。该项目将积累数据和知识，可用于验证各种全球模型，特别是全球磁流体动力学模拟模型，耦合热层-电离层-磁层-太阳风系统。

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.