Statistical observations of the MLT, latitude and size of pulsed ionospheric flows with the CUTLASS Finland radar
Statistical observations of the MLT, latitude and size of pulsed ionospheric flows with the CUTLASS Finland radar
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DOI：
10.1007/s00585-999-0855-1
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发表时间：
1999-07
影响因子：
1.9
通讯作者：
G. Provan;T. Yeoman
中科院分区：
文献类型：
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作者：
G. Provan;T. Yeoman
对卡特拉斯芬兰高频雷达探测到的脉冲电离层流动的发生情况进行了研究。有人认为，这些流动是在磁通量向地球磁层转移(通量转移事件或FTE)期间，在新重新连接的磁力线的电离层足迹处产生的。对芬兰卡特拉斯雷达两年的高时间分辨率和正常扫描数据进行了分析，以便对脉冲电离层流动的范围和位置进行统计研究。我们注意到脉冲电离层流动的相干雷达观测的统计模式与传统的低空卫星识别与尖端/裂隙区域相关的粒子特征之间有很大的相似之处。然而，相干散射雷达的观测表明，合并间隙比Newell和Meng模型所提出的要宽得多。由Lockwood和Onsager以及Lockwood提出的新的尖点低空粒子特征模型提供了一个统一的框架来解释低空卫星和相干散射雷达探测到的白天降水机制。
A study has been performed on the occurrence of pulsed ionospheric flows as detected by the CUTLASS Finland HF radar. These flows have been suggested as being created at the ionospheric footprint of newly-reconnected field lines, during episodes of magnetic flux transfer into the terrestrial magnetosphere (flux transfer events or FTEs). Two years of both high-time resolution and normal scan data from the CUTLASS Finland radar have been analysed in order to perform a statistical study of the extent and location of the pulsed ionospheric flows. We note a great similarity between the statistical pattern of the coherent radar observations of pulsed ionospheric flows and the traditional low-altitude satellite identification of the particle signature associated with the cusp/cleft region. However, the coherent scatter radar observations suggest that the merging gap is far wider than that proposed by the Newell and Meng model. The new model for cusp low-altitude particle signatures, proposed by Lockwood and Onsager and Lockwood provides a unified framework to explain the dayside precipitation regimes observed both by the low-altitude satellites and by coherent scatter radar detection.