Investigation of the relationship between optical auroral forms and HF radar E region backscatter
Investigation of the relationship between optical auroral forms and HF radar E region backscatter
复制标题
光学极光形态与高频雷达E区后向散射关系的研究
DOI：
10.1007/s00585-000-0608-7
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发表时间：
2000
影响因子：
1.9
通讯作者：
J. Villain
中科院分区：
文献类型：
--
作者：
S. E. Milan;Mark Lester;Natsuo Sato;Hiroyuki Takizawa;J. Villain
SuperDARN高频雷达过去曾用于研究极光E区L壳层排列特征的相干后向散射光谱特征。本研究采用冰岛Husafell的极光全天空相机观测，以及位于冰岛的两个SuperDARN雷达，Ekykkvibær和Stokkseyri，以确定这种后向散射特征的光学特征。结果表明，特别是在安静的地磁条件下，后向散射区是密切相关的东西对齐的扩散极光的功能，这两个移动在一起。光学极光和雷达极光之间的这种联系对产生E区不规则性的不稳定机制产生了影响，雷达从E区不规则性中散射。这是讨论和以前的研究调查光学和VHF雷达极光之间的关系进行了比较。此外，虽然它是已知的，E区域的后向散射通常由SuperDARN雷达观察到，本研究首次表明，多个雷达可以观察到相同的功能，以延长至少3小时的磁当地时间，使降水功能被映射到极光区的大部分。
The SuperDARN HF radars have been employed in the past to investigate the spectral characteristics of coherent backscatter from L-shell aligned features in the auroral E region. The present study employs all-sky camera observations of the aurora from Husafell, Iceland, and the two SuperDARN radars located on Iceland, Þykkvibær and Stokkseyri, to determine the optical signature of such backscatter features. It is shown that, especially during quiet geomagnetic conditions, the backscatter region is closely associated with east-west aligned diffuse auroral features, and that the two move in tandem with each other. This association between optical and radar aurora has repercussions for the instability mechanisms responsible for generating the E region irregularities from which radars scatter. This is discussed and compared with previous studies investigating the relationship between optical and VHF radar aurora. In addition, although it is known that E region backscatter is commonly observed by SuperDARN radars, the present study demonstrates for the first time that multiple radars can observe the same feature to extend over at least 3 h of magnetic local time, allowing precipitation features to be mapped over large portions of the auroral zone.