CEDAR: Low-Latitude Electrodynamics

CEDAR：低纬度电动力学

• 批准号: 9714669
• 负责人: Roland Tsunoda
• 金额: $ 5.99万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-01-15 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9714669&HistoricalAwards=false
• 关键词: CEDAR; Low; Latitude; Electrodynamics

Seven portable magnetometers, used for CEDAR investigations of electrodynamics in the low-latitude ionosphere, are performing experiments with chained or clustered sensors. Investigators hope to gain knowledge of large day-to-day variability found in equatorial electrojet, Sq current system, Appleton ionization anomaly, and equatorial spread F. Previously hampered in investigations of low-latitude electrodynamics, researchers are filling the lower-altitude data gap by combining ground-based sensors, including an ionosonde, a backscatter radar, and a chain of magnetometers. The magnetometers estimate the overhead current as a function of magnetic dip latitude. Then, these estimates convert to those of drift velocity, latitudinal variation in drift velocity converts into electric-field variation with altitude over the dip equator, and the magnetometer measurements provide time-continuous data along a magnetic meridian with spatial coverage in both hemispheres. Beyond these studies, the magnetometers will also be deployed under other CEDAR and Space Weather projects.

用于研究低纬电离层电动力学的七台便携式磁强计正在用链式或集群式传感器进行实验。研究人员希望了解在赤道电喷流、Sq电流系统、阿普尔顿电离异常和赤道扩散F中发现的大的日常变化。以前，在低纬电动力学的研究中受到阻碍，研究人员正在通过结合地面传感器来填补较低海拔的数据空白，这些传感器包括一个电离探测仪、一个后向散射雷达和一系列磁力计。磁力计估计作为磁倾角纬度的函数的架空电流。然后，这些估计转换为漂移速度的估计，漂移速度的纬向变化转换为倾角赤道上空随高度的电场变化，磁力仪测量提供沿磁子午线的时间连续数据，空间覆盖在两个半球。除了这些研究外，磁力仪还将在雪松和空间天气项目下部署。