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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Interhemispheric Survey of Polar Cap Aurora
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Interhemispheric Survey of Polar Cap Aurora

机译：两半球间的极冠极光的调查

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This study investigates the interhemispheric nature of polar cap auroras via ultraviolet imaging, combined with particle data, to determine whether they occur on open or closed field lines. Data from the SSUSI (Special Sensor Ultraviolet Spectrographic Imager) instrument on board the DMSP (Defence Meteorological Satellite Program) spacecraft are examined. The DMSP spacecraft are in 90-min orbits; hence, images of each hemisphere are separated by 45 min providing a good opportunity for interhemispheric study. 21 polar cap arc (PCA) events are recorded in December 2015 which have particle data from the SSJ/4 particle spectrometer associated with an arc in at least one hemisphere. Nine events are found to contain "arcs" consistent with a closed field line mechanism, that is, arcs associated with an ion signature present in both hemispheres. Six events contained arcs that were consistent with an "open field line" mechanism, that is, they were associated with electron-only precipitation. Events containing arcs that were not consistent with either of these expectations are also explored, including an example of a "non-conjugate" theta aurora and an interesting example of auroral morphology similar to a PCA which is associated with a geomagnetic storm. Seasonal effects are also investigated through a statistical analysis of PCAs over 4 months in 2015. It is found that PCAs are visible in the SSUSI data at least 20% of the time and that it is likely some are missed due to the spacecraft field of view and poor sensitivity in the summer hemisphere due to increased solar illumination.
机译：本研究探讨两半球间的通过紫外线的极冠极光粒子成像技术,结合数据,确定他们是否发生在打开或关闭电场线。紫外光谱成像仪)文书董事会DMSP(国防气象卫星检查程序)宇宙飞船。飞船在90分钟的轨道;每个半球由45分钟提供两半球间的研究一个很好的机会。极冠弧(PCA)事件记录2015年12月,粒子的数据行业/ 4粒子能谱仪与一个关联电弧在至少一个半球。发现含有“弧”与一个封闭的一致行机制,弧线相关联与离子在两个签名礼物半球。符合一个“田野线”机制,也就是说,他们与electron-only有关降水。不符合这些期望也探索,包括的一个例子吗“non-conjugate”θ极光和一个有趣的极光形态类似于主成分分析的例子这是与地磁风暴有关。季节性影响也通过调查统计分析PCAs超过4个月2015. SSUSI数据至少20%的时间和它可能有些人错过由于宇宙飞船吗在夏天的视野和糟糕的敏感性由于增加了太阳能照明半球。

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