Proposed Continued Operation of an ELF/VLF Radiometer at Arrival Heights, Antarctica

拟在南极洲到达高地继续运行 ELF/VLF 辐射计

• 批准号: 0637005
• 负责人: Antony Fraser-Smith
• 金额: $ 1.96万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-07-01 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0637005&HistoricalAwards=false
• 关键词: Proposed; Continued; Operation; ELF; VLF

This three year continuation of a program to monitor ELF/VLF radio noise (frequencies in the range 5 Hz to 32 kHz) at Arrival Heights, Antarctica, will extend the observational record to more than twenty-five years, and will allow more precise estimates of and limits on noise statistics. The radiometer was first installed at its present location during the austral summer of 1984-5 and has provided a record of ELF/VLF noise in the Antarctic that is unprecedented in its continuity and duration. In parallel with this system, identical ones are currently in operation at Sondrestromfjord, Greenland, and on the Stanford University campus. These additional systems provide comparison data for the arctic and for mid-latitudes.Since the predominant sources of ELF/VLF radio noise are thunderstorms occurring in the tropical regions, these three systems provide complementary views of the thunderstorm activity occurring in the tropics. The long-term statistics can then provide independent information about global change. The low background in the Arrival Heights record further allows the determination of Schumann resonances, quasi-standing waves that exist in the Earth's electromagnetic cavity (the space between the surface of the Earth and the Ionosphere). Temporal changes in these resonant frequencies can be related to variations in the characteristics of the ionosphere. Because of the great difficulty of making long-term observations, particularly at remote locations, the Arrival Heights measurements are increasing in scientific value as the radiometer continues in operation.

在南极到达高地监测极低频/甚低频无线电噪声（频率范围为5赫兹至32千赫）的计划将持续三年，观测记录将延长到25年以上，并将允许对噪声统计进行更精确的估计和限制。该辐射计于1984- 1985年南极夏季首次安装在目前的位置，并提供了南极ELF/VLF噪声的记录，其连续性和持续时间是前所未有的。与此同时，格陵兰的Sondrestromfjord和斯坦福大学校园也在运行相同的系统。 由于极低频/甚低频无线电噪音的主要来源是热带地区发生的雷暴，这三个系统提供了热带地区雷暴活动的补充视图。长期统计数据可以提供关于全球变化的独立信息。到达高度记录中的低背景进一步允许确定舒曼共振，即存在于地球电磁空腔（地球表面和电离层之间的空间）中的准驻波。这些共振频率的时间变化可能与电离层特性的变化有关。由于很难进行长期观测，特别是在偏远地区，随着辐射计的继续运行，到达高度测量的科学价值正在增加。