The influence of magnetospheric substorms on SuperDARN radar backscatter
The influence of magnetospheric substorms on SuperDARN radar backscatter
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DOI：
10.1029/2007ja012910
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发表时间：
2008-04
影响因子：
--
通讯作者：
J. Wild;A. Grocott
中科院分区：
文献类型：
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作者：
J. Wild;A. Grocott
SuperDARN电离层雷达网是调查近地空间环境的主要工具。然而，据报道，在磁层亚暴期间电离层后向散射减少。因此，我们研究了在3005次亚暴期间亚暴对SuperDARN后向散射的影响，发现就在亚暴开始之前，全球的散布水平达到最大。在夜间电离层，∼70°磁纬度的后向散射极向减少，雷达回波向低纬度移动。对亚暴期间夜间后向散射演变的频率依赖性的研究表明，尽管大多数后向散射数据是基于08-14 MHz范围内的操作，但较高的操作频率可能会在扩展阶段开始之前和之后的一段时间内提供更好的性能。我们认为，SuperDARN高频相干-散射雷达阵列，特别是那些能够同时在两个频率下工作的雷达，将在未来的空间和地面亚暴研究中发挥关键作用。
The SuperDARN ionospheric radar network is a leading tool for investigating the near-Earth space environment. However, reductions in ionospheric backscatter have been reported during magnetospheric substorms. We have therefore investigated the impact of substorms upon SuperDARN backscatter during 3005 substorms and find that the global level of scatter maximizes just prior to substorm onset. In the nightside ionosphere, backscatter poleward of ∼70° magnetic latitude is reduced, with radar echoes shifting to lower latitudes. An examination into the frequency-dependence of nightside backscatter evolution during substorms reveals that although most backscatter data is based upon operations in the 08–14 MHz range, higher operating frequencies may offer improved performance in the period just prior to and immediately following expansion phase onset. We suggest that the SuperDARN array of high-frequency coherent-scatter radars, and in particular those radars with the ability to simultaneously operate at dual frequencies, will play a key role in future space- and ground-based studies of substorms.