Imaging the midlatitude sporadic E plasma patches with a coordinated observation of spaceborne InSAR and GPS total electron content
Imaging the midlatitude sporadic E plasma patches with a coordinated observation of spaceborne InSAR and GPS total electron content
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DOI：
10.1002/2015gl067585
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发表时间：
2016-02
影响因子：
5.2
通讯作者：
J. Maeda;T. Suzuki;M. Furuya;K. Heki
中科院分区：
文献类型：
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作者：
J. Maeda;T. Suzuki;M. Furuya;K. Heki
利用日本西南部L波段高级陆地观测卫星/相控阵L波段合成孔径雷达数据，首次直接对中纬度零星E（Es）等离子体斑片的千米级精细结构进行了成像。合成孔径雷达干涉图捕捉到白天中纬度Es的大规模锋面结构的东部，该结构在东北偏东到西南偏西方向上跨越250公里。精细结构的特征在于在与大尺度前部结构相同的方向上伸长的前部和盘状斑块。盘状斑块的长度和宽度分别为10-20 km和5-10 km，它们呈准周期性分布，典型间隔为10-15 km。带有纬向风垂直切变的Kelvin-Helmholtz不稳定性被认为是锋斑和沿纬向排列的盘状斑最有可能的生成机制。
Kilometer‐scale fine structures of midlatitude sporadic E (Es) plasma patches have been directly imaged for the first time by an interferogram derived from L band Advanced Land Observation Satellite/Phased Array‐type L band Synthetic Aperture Radar data obtained over southwestern Japan. The synthetic aperture radar interferogram captured the eastern part of a large‐scale frontal structure of daytime midlatitude Es which spans over 250 km in the east‐northeast to west‐southwest direction. Fine structures are characterized by frontal and disc‐shaped patches which are elongated in the same direction as the large‐scale frontal structure. Length and width of the disc‐shaped patches are 10–20 km and 5–10 km, respectively, and they are quasi‐periodically located with a typical separation of 10–15 km. The Kelvin‐Helmholtz instability with the vertical shear of zonal winds is considered to be the most likely candidate for the generation mechanism of the frontal patch and disc‐shaped patches aligned in the zonal direction.