Rankin Inlet PolarDARN radar observations of duskward moving Sun-aligned optical forms
Rankin Inlet PolarDARN radar observations of duskward moving Sun-aligned optical forms
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DOI：
10.5194/angeo-26-2711-2008
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发表时间：
2008-09
影响因子：
1.9
通讯作者：
A. Koustov;K. Hosokawa;N. Nishitani;T. Ogawa;K. Shiokawa
中科院分区：
文献类型：
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作者：
A. Koustov;K. Hosokawa;N. Nishitani;T. Ogawa;K. Shiokawa
2007年2月15日，加拿大努纳武特雷索卢特湾的全天空照相机观测到了几个向黄昏移动的太阳向极光。与兰金入口（RANK）PolarDARN高频雷达在相机的视场内进行的同步观测表明，在所有信号参数中，移动极光形式的特征最显着的影响是当弧到达特定的雷达波束/门时，回波功率下降和速度反转。SA形式附近的速度的空间和时间变化进行了研究。结果表明，形式相关的对流反转位于极向（黄昏）的全球尺度对流反转与黎明单体的大尺度对流模式。因此，RANK雷达正在监测全球尺度对流模式的极冠部分及其从IMF B y B y >0情况的转变。本文研究了与SA形通过几个磁强计天顶有关的磁扰动。结果表明，虽然磁力计签名的移动形式是明确的，对流模式推导从磁力计记录单独是不简单的。
On 15 February 2007, several duskward moving sun-aligned (SA) auroral forms have been observed by the all-sky camera at Resolute Bay, Nunavut (Canada). Concurrent observations with the Rankin Inlet (RANK) PolarDARN HF radar within the field-of-view of the camera showed signatures of moving auroral forms in all signal parameters with the most remarkable effects being the echo power drop and velocity reversal as the arc reached a specific radar beam/gate. Spatial and temporal variations of the velocity in the vicinity of the SA form are investigated. It is shown that the form-associated convection reversal was located poleward (duskward) of the global-scale convection reversal associated with the dawn cell of the large-scale convection pattern. Thus, the RANK radar was monitoring the polar cap portion of the global-scale convection pattern and its transition from the IMF B y B y >0 situation. Magnetic perturbations associated with the SA form passing the zenith of several magnetometers are investigated. It is shown that although magnetometer signatures of the moving form were clear, the convection pattern derivation from magnetometer records alone is not straightforward.