...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Survey of ULF wave signatures seen in the Tasman International Geospace Environment Radars data
【24h】

Survey of ULF wave signatures seen in the Tasman International Geospace Environment Radars data

机译：在塔斯曼的调查ULF波签名国际地球空间环境的雷达数据

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ultralow frequency (ULF) plasma waves propagate through the magnetosphere and ionosphere where they can alter the Doppler velocity of HF radar echoes. Data from the two Tasman International Geospace Environment Radars and the fluxgate and induction coil magnetometers located on Macquarie Island (54.5°S, 158.95°E geographic) over 2006–2009 show that ULF wave signatures are common. Using coincident radar and magnetometer data selection criteria, 194 events representing a total of 233.4 h were identified. The majority of ULF signatures seen in the radar data were detected between 06 and 12 UT (15 and 21 LT). Using the Maximum Entropy Method, the spectral content showed favored frequencies of 1.6, 2.1, 2.9, and 3.3 mHz but no obvious variation of frequency with latitude. Most of the observed frequencies were in the range 1–4 mHz. A class of Doppler velocity signatures that appeared as a zigzag shape in the radar range:time plots were identified andmay be related to the expected plasmapause latitudes. Regularly spaced, favored frequencies appeared in the ground magnetometer data during the afternoon, night, and morning sectors for those days where ULF wave events were observed in the radar data.
机译：超低频(ULF)等离子体波传播通过磁气圈和电离层他们可以改变高频雷达的多普勒速度回声。雷达和磁通门和地球空间环境感应线圈磁力计位于麦格理岛(54.5°S, 158.95°E地理)2006 - 2009显示ULF波签名常见的。数据选择标准,代表194个事件总共233.4 h被确定。ULF签名的雷达数据检测到06至12 UT(15和21 LT)。使用最大熵方法,光谱内容显示,支持频率的1.6,2.1,2.9和3.3 mHz,但没有明显的变化频率与纬度。频率范围在1 - 4 mHz。多普勒速度出现作为一个签名情节曲折形状的雷达范围:时间可能会与预期的识别等离子体层顶纬度。频率出现在地面磁力仪数据在下午、晚上和早晨部门对那些日子ULF波事件的地方观察到的雷达数据。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号