Determination of low latitude plasma drift speeds from FUV images
Determination of low latitude plasma drift speeds from FUV images
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从 FUV 图像确定低纬度等离子体漂移速度
DOI：
10.1029/2003gl017573
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发表时间：
2003
影响因子：
5.2
通讯作者：
E. Sagawa
中科院分区：
文献类型：
--
作者：
T. Immel;S. Mende;H. Frey;L. Peticolas;E. Sagawa
NASA IMAGE 卫星上的远紫外线成像仪（FUV）已经获得了数千张夜间赤道气辉弧的图像。在卫星远地点周围持续几个小时的成像周期可以确定气辉弧内发生的漂移等离子体密度损耗的速度。这些速度反映了低纬度等离子体在垂直电场影响下的 E × B 漂移。对几周数据的调查产生了有关漂移速度随太阳 10.7 厘米射电通量变化的信息。与之前 Jicamarca 雷达测量结果的比较表明，FUV 确定的等离子体漂移速度高出 10-35%，特别是在当地时间 2100 年之前。这种差异主要归因于观测的磁纬度不同。
Thousands of images of the nighttime equatorial airglow arcs have been obtained by the Far‐Ultraviolet Imager (FUV) on‐board the NASA IMAGE satellite. Imaging periods lasting several hours around the time of satellite apogee allow for the determination of the velocity of drifting plasma density depletions occurring within the airglow arcs. These velocities reflect the E × B drift of low‐latitude plasma under the influence of a vertical electric field. A survey of several weeks of data produces information regarding the variation of drift speeds with solar 10.7‐cm radio flux. Comparisons to previous measurements by the Jicamarca radar show that the FUV‐determined plasma drift speeds are 10–35% greater, particularly before 2100 local time. This difference is attributed mainly to the different magnetic latitudes of the observations.