SuperDARN in Ireland: A Mid-Latitude Geospace Facility to Study Electrodynamic Coupling in the European and Scandinavian Sectors

爱尔兰的 SuperDARN：研究欧洲和斯堪的纳维亚地区电动力耦合的中纬度地理空间设施

• 批准号: 1655193
• 负责人: Simon Shepherd
• 金额: $ 44.31万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-03-01 至 2024-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1655193&HistoricalAwards=false
• 关键词: SuperDARN; Ireland; Mid; Latitude; Geospace

The proposed project involves the construction and calibration of a pair of Super-DARN radars at a single site in central Ireland. The two SuperDARN radars, with a combined field-of-view exceeding ±75 in azimuth centered on the magnetic meridian, will be capable of making measurements of the ionospheric electric field over a region that includes eastern North America, Greenland, Iceland, Scandinavia and western Russia. Measurements in this sector, currently limited to the region north of 65 latitude, will extend the capabilities of the SuperDarn network to provide near real-time maps of the convection electric field during an expanded range of geomagnetic activity levels and increase the local time (LT) coverage to more than 12 hours. Existing radars at similar latitudes have demonstrated the importance of measurements from radars located at mid-latitudes during quiet to more active geomagnetic conditions and in particular, the ability of these radars to make detailed measurements of the sub-auroral polarization stream (SAPS) on rapid timescales (1 min) over an extended range (8 hours LT). The installation of the two SuperDarn radars in Ireland would make possible investigations of longitudinal differences associated with the South Atlantic Anomaly in SAPS and electric field structuring as well as conjugate studies with southern hemisphere radars. In line with the geospace community review panel recommendations, distributed networks of ground-based instruments are quite valuable in resolving space-time ambiguities associated with sparse measurements of the space environment and making progress toward the science goals of the Solar Wind-Magnetosphere Interactions. The Ireland radars will significantly increase measurements of the electric field at mid-latitudes enabling SuperDARN to provide real-time observations of space weather disturbances in the ionosphere extending from Asia, across North America and into Northern Europe. This should result in significant progress toward the larger goal of providing the capability to predict the effects of solar variability on the environment and on society.An important aspect of the proposed project is the calibration of SuperDARN elevation angle measurements which can be used to improve the geolocation of backscattered signals, to discriminate between propagation modes and to estimate the index of refraction at the scattering location - this is now normally done by modeling using ray tracing software, and such models might be in error at times.The project includes a small augmentation that will enable one of the interferometer arrays to be configurable and allow for testing of the sensitivity and accuracy of SuperDARN interferometers. Ireland is ideally situated for interferometer testing with two Scandinavian ionospheric heating facilities providing a calibration source within the field-of-view of the augmented radar. The project would very efficiently reuse most of a ready-to-go radar system that for various logistical and political reasons never got installed in the Azores. This is a highly targeted re-purposed application that minimizes substantially the installation budget.

拟议的项目包括在爱尔兰中部的一个地点建造和校准一对Super-DARN雷达。这两个SuperDARN雷达的组合视场超过以磁子午线为中心的±75方位角，将能够测量包括北美东部，格陵兰岛，冰岛，斯堪的纳维亚半岛和俄罗斯西部在内的地区的电离层电场。该区域的测量目前仅限于北纬65度以北地区，将扩大SuperDarn网络的能力，在扩大的地磁活动水平范围内提供对流电场的近实时地图，并将当地时间（LT）覆盖范围增加到12小时以上。在类似纬度的现有雷达已经证明了在平静到更活跃的地磁条件下，位于中纬度的雷达进行测量的重要性，特别是这些雷达在扩展范围（8小时LT）内以快速时标（1分钟）对亚极光偏振流进行详细测量的能力。 在爱尔兰安装两个SuperDarn雷达将有可能调查与SAPS和电场结构中的南大西洋异常有关的纵向差异，以及与南半球雷达的共轭研究。根据地球空间界审查小组的建议，分布式地面仪器网络在解决与空间环境稀疏测量有关的时空模糊性和朝着太阳风-磁层相互作用的科学目标取得进展方面非常有价值。爱尔兰的雷达将大大增加对中纬度电场的测量，使SuperDARN能够提供对从亚洲延伸到北美洲和北方的电离层空间天气扰动的实时观测。 这将导致在提供预测太阳变化对环境和社会影响的能力这一更大目标方面取得重大进展。拟议项目的一个重要方面是校准SuperDARN仰角测量值，该测量值可用于改善后向散射信号的地理定位，以区分传播模式并估计散射位置处的折射率-这现在通常通过使用射线跟踪软件建模来完成，该项目包括一个小的增强，使其中一个干涉仪阵列能够配置，并允许测试SuperDARN干涉仪的灵敏度和准确度。爱尔兰的地理位置非常适合进行干涉仪测试，有两个斯堪的纳维亚电离层加热设施，可在增强雷达的视场内提供校准源。该项目将非常有效地重复使用大部分准备就绪的雷达系统，由于各种后勤和政治原因，该系统从未安装在亚速尔群岛。这是一个高度有针对性的重新用途的应用程序，大大减少了安装预算。