Reconfiguration of polar-cap plasma in the magnetic midnight sector
Reconfiguration of polar-cap plasma in the magnetic midnight sector
复制标题
午夜磁区极帽等离子体的重新配置
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
M. Lester
中科院分区：
文献类型：
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作者：
S. E. Pryse;A. Wood;H. Middleton;I. McCrea;M. Lester
无线电层析成像和EISCAT和SuperDARN雷达已被用来识别长寿命的，高海拔，冷等离子体的反向阳对流穿过极冠。投影的功能，后来的时间表明，它是重新配置在哈朗不连续，形成一个增强，是在经度上的高纬度对流模式的向阳回流拉长。在稍后的时间与断层图像的比较支持被重新配置为边界斑点的极补丁的解释。也有证据表明，第二等离子体增强赤道方向的重新配置的斑点，可能已产生的原位沉淀。观测结果表明，在文献中提出的两种机制的边界斑点的生产同时运作，形成两个不同的密度功能略有分离的纬度。
Radio tomography and the EISCAT and SuperDARN radars have been used to identify long-lived, high-altitude, cold plasma in the antisunward convective flow across the polar cap. The projection of the feature to later times suggests that it was reconfigured in the Harang discontinuity to form an enhancement that was elongated in longitude in the sunward return flow of the high-latitude convection pattern. Comparison with a tomographic image at a later time supports the interpretation of a polar patch being reconfigured into a boundary blob. There is also evidence for a second plasma enhancement equatorward of the reconfigured blob, likely to have been produced by in situ precipitation. The observations indicate that the two mechanisms proposed in the literature for the production of boundary blobs are operating simultaneously to form two distinct density features separated slightly in latitude.