Geomagnetic conjugate observations of equatorial airglow depletions
Geomagnetic conjugate observations of equatorial airglow depletions
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DOI：
10.1029/2002gl015347
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发表时间：
2002-08
影响因子：
5.2
通讯作者：
Yuichi Otsuka;K. Shiokawa;T. Ogawa;P. Wilkinson
中科院分区：
文献类型：
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作者：
Yuichi Otsuka;K. Shiokawa;T. Ogawa;P. Wilkinson
我们首次报告了大规模的赤道F区气辉耗尽，延伸到两个半球的中低纬度地区。观测地点位于低中纬度地磁共患难点。2001年11月12日晚，在日本佐田（磁纬24°N）和澳大利亚达尔文（磁纬22°S）的地磁共扼点，用两台全天空成像仪同时观测到赤道等离子体泡引起的630.0 nm气辉强度的明显衰减。东西尺度为40-100 km的气辉耗尽区向极地延伸。等离子体泡的最大顶点高度约为地磁赤道上方1，700公里。损耗以约100 m/s的速度向东移动，而不改变其结构。沿着地磁场映射到北方半球的达尔文耗尽结构与Sata图像中的结构非常一致，即使是40公里的结构。这些观测结果表明，赤道电离层中的等离子体耗尽沿地磁场线沿着伸长。
We report for the first time large‐scale equatorial F‐region airglow depletions extending to low‐midlatitudes in both hemispheres. The observational sites were located at low‐midlatitude geomagnetic conjugate points. Clear depletions of 630.0‐nm airglow intensity due to equatorial plasma bubbles were simultaneously observed with two all‐sky imagers at Sata, Japan (magnetic latitude 24°N), and its geomagnetic conjugate point, Darwin, Australia (magnetic latitude 22°S), on the night of November 12, 2001. Airglow depletion regions with east‐west scale sizes of 40–100 km extend poleward. The maximum apex altitude of the plasma bubbles is about 1,700 km over the geomagnetic equator. The depletions move eastward at about 100 m/s, without changing their structures. The Darwin depletion structures mapped onto the northern hemisphere along the geomagnetic field coincide closely with structures in the Sata images, even for the 40‐km structure. These observations indicate that plasma depletions in the equatorial ionosphere elongate along the geomagnetic field lines.