A survey of small‐scale spatially periodic distortions of auroral forms
A survey of small‐scale spatially periodic distortions of auroral forms
复制标题
极光形态小尺度空间周期性畸变的调查
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
L. Cogger
中科院分区：
文献类型：
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作者：
T. Trondsen;L. Cogger
介绍了卡尔加里大学便携式极光成像仪对称为“卷曲”的极光形式的小尺度空间周期性扭曲进行的高分辨率电视观测。在1995年和1997年冬季实地考察兔子湖，萨斯喀彻温省，加拿大，获得了大量的视频数据，包含极光卷曲。对这一数据集的分析大大提高了对这些特征属性的洞察力。观察到的空间和时间特征，与以前的调查结果相比，在适用的情况下。引人注目的相似之处，这些100公里尺度大小的卷曲的特点和100公里尺度大小的极光“螺旋”观测的Freja紫外线成像仪的特点指出，并讨论了剪切驱动的不稳定性。此外，还简要介绍了“极光扭结”和“旋转极光斑”等有趣的新现象的观测。
High-resolution television observations by the University of Calgary portable auroral imager of the small-scale spatially periodic distortions of auroral forms known as “curls” are presented. During winter 1995 and 1997 field trips to Rabbit Lake, Saskatchewan, Canada, a large amount of video data containing auroral curls was acquired. Analysis of this data set has led to much improved insight into the properties of these features. Observed spatial and temporal characteristics are presented, with results compared to those of earlier surveys wherever applicable. Striking parallels between the characteristics of these ∼1 km scale size curls and the characteristics of the ∼ 100 km scale size auroral “spirals” observed by the Freja UV imager are pointed out and discussed in terms of shear-driven instabilities. In addition, observations of the interesting new phenomena of “auroral kinks” and “spinning auroral patches” are briefly described.