Antarctic and Conjugate Research using SuperDARN

使用 SuperDARN 进行南极和共轭研究

• 批准号: 2053309
• 负责人: William Bristow
• 金额: $ 37.63万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2053309&HistoricalAwards=false
• 关键词: Antarctic; Conjugate; Research; using; SuperDARN

The Super Dual Auroral Radar Network (SuperDARN) is composed of high-frequency radars that can observe far reaches of the Earth's ionosphere, its features and irregularities, and monitor its dynamics. The ionosphere is an ionized layer in the upper atmosphere (at and above ~110-km altitude) where electrical currents can flow in response to the coupling between the Earth's magnetosphere and solar wind plasma flow in the Earth's neighborhood (geospace). Many geospace phenomena are caused by solar flares and coronal mass ejections that have their effects transmitted to ionospheric layers, which are especially strong in the polar regions. The ionospheric plasma convection (that carries ionospheric currents) becomes strong during geomagnetic storms when it moves as a whole over both polar caps from dayside to nightside and then returns to the dayside via respective auroral zones. Polar ionospheres are also electrically connected via the Earth's magnetic field lines in conjugate points. The ionospheric connection plays a very important role in transporting currents and electric fields between the magnetopause and both polar regions, but these processes are still insufficiently studied. The large network of SuperDARN radars already observe ionospheric convection in the northern and southern polar regions on a regular basis. Data from these radars are used to study responses of ionospheric convection to solar wind and interplanetary magnetic field changes, the relation of central polar cap convection to that of the cusp and midnight regions, and to the state of the coupled magnetosphere-ionosphere system. The NSF-funded Antarctic SuperDARN radars at McMurdo and South Pole contribute to the studies such as relationships between wave structures observed in the solar wind and respective responses in the polar caps, motion of plasma density structures, ion-neutral coupling, and thermospheric winds. This research effort will continue developing the NSF-funded radars, help addressing fundamental questions of the Geospace research that have not yet thoroughly examined.

超级双极光雷达网（SuperDARN）由高频雷达组成，可以观测地球电离层的远距离、其特征和不规则性，并监测其动态。电离层是高层大气（约110公里及以上）中的电离层，电流可以响应地球磁层和地球附近（地球空间）太阳风等离子体流之间的耦合而流动。许多地球空间现象是由太阳耀斑和日冕物质抛射造成的，它们的影响传递到电离层，而电离层在极地地区特别强烈。电离层等离子体对流（携带电离层电流）在磁暴期间变得很强，当它作为一个整体从昼侧移动到夜侧，然后通过各自的极光区返回到昼侧。极地电离层也通过地球的磁场线在共轭点上电连接。电离层连接在磁层顶和两极区之间的电流和电场传输中起着非常重要的作用，但这些过程仍然没有得到充分的研究。SuperDARN雷达的大型网络已经在定期观测北方和南极地区的电离层对流。这些雷达的数据被用来研究电离层对流对太阳风和行星际磁场变化的响应，中心极冠对流与尖点和午夜区域的关系，以及磁层-电离层耦合系统的状态。美国国家科学基金会资助的南极超级DARN雷达在麦克默多和南极的贡献的研究，如在太阳风中观察到的波结构和相应的反应在极冠，等离子体密度结构的运动，离子中性耦合，和热层风之间的关系。这项研究工作将继续开发NSF资助的雷达，帮助解决尚未彻底研究的地球空间研究的基本问题。