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

南极洲到达高地 ELF/VLF 辐射计的操作

• 批准号: 0138126
• 负责人: Antony Fraser-Smith
• 金额: $ 2.62万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-05-01 至 2007-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0138126&HistoricalAwards=false
• 关键词: Operation; ELF; VLF; Radiometer; Arrival

This four 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 years, and will allow more precise estimates of noise statistics. The radiometer was first installed at its present location during the austral summer of 1984-5 and has been operated continuously since that time, thus providing a record of ELF/VLF noise in the Antarctic that is unprecedented in its continuity and duration. In parallel with this system, an identical one has been operating on the Stanford University campus for almost the same period of time, thus providing a (northern) mid-latitude comparison data set. Since the predominant sources of ELF/VLF radio noise are thunderstorms occurring in the tropical regions, the Arrival Heights and Stanford 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. These are quasi-standing electro-magnetic 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.

在南极洲到达高地监测极低频/甚低频无线电噪声（频率范围在5赫兹至32千赫）的计划持续了四年，将把观测记录延长到二十多年，并将允许对噪声统计进行更精确的估计。 该辐射计于1984- 1985年南极夏季首次安装在目前的位置，自那时以来一直在持续运行，从而提供了南极极低频/甚低频噪声的记录，其连续性和持续时间是前所未有的。与该系统并行的是，一个相同的系统在斯坦福大学校园内运行了几乎相同的时间，从而提供了（北方）中纬度比较数据集。 由于极低频/甚低频无线电噪声的主要来源是发生在热带地区的雷暴，到达高地和斯坦福大学系统提供了发生在热带地区的雷暴活动的补充意见。 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。 这些是存在于地球“电磁”腔（地球表面和电离层之间的空间）中的准驻波电磁波。 这些共振频率的时间变化可能与电离层特性的变化有关。