CEDAR: An Investigation of the Anomalous Pedersen Current Driven by the E Region Plasma Turbulence

CEDAR：E 区等离子体湍流驱动的异常佩德森电流的调查

• 批准号: 1042243
• 负责人: Hasan Bahcivan
• 金额: $ 35.3万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-02-15 至 2015-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1042243&HistoricalAwards=false
• 关键词: CEDAR; Investigation; Anomalous; Pedersen; Current

This project is to derive empirical estimates of the electric field-aligned (Pederson) current carried by electrons in the auroral ionosphere near 120 km (the E-region). The electron Pederson current, typically much smaller than that carried by ions, is hypothesized to be driven under conditions of strong electric fields by the dissipation of plasma instabilities known as Farley-Buneman waves. Estimates of this "anomalous" Pederson current will be inferred from discrepancies between total ground magnetic deflection as measured by an extensive network of high-latitude magnetometers and that derived from incoherent scatter radar (ISR) measurements using a multiple-beam transmission mode. A large set of combined magnetometer and ISR data will be used to generate statistical estimates of the anomalous electron Pederson current and associated turbulence heating rate of the thermosphere/ionosphere. This project will involve the participation of both graduate and undergraduate students during summer collaborations between SRI International and Worcester Polytechnic Institute.

该项目旨在对 120 公里附近的极光电离层（E 区）中的电子携带的电场对准（Pederson）电流进行经验估计。 电子佩德森电流通常比离子携带的电流小得多，假设在强电场条件下，由等离子体不稳定性（称为法利-布尼曼波）的消散驱动。 对这种“异常”佩德森电流的估计将根据高纬度磁力计广泛网络测量的总地面磁偏转与使用多波束传输模式的非相干散射雷达（ISR）测量得出的总地面磁偏转之间的差异来推断。 大量磁力计和ISR组合数据将用于生成异常电子佩德森电流和热层/电离层相关湍流加热速率的统计估计。 该项目将让研究生和本科生参与 SRI 国际和伍斯特理工学院之间的夏季合作。