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首页> 外文期刊>Geophysical Research Letters >Unusually elongated, bright airglow plume in the polar cap F region: Is it a tongue of ionization?
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Unusually elongated, bright airglow plume in the polar cap F region: Is it a tongue of ionization?

机译：极帽F区域中异常细长的明亮的气焰羽：这是电离的舌头吗？

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We report an event of unusually elongated, bright airglow plume, which is considered as an optical manifestation of tongue of ionization (TOI) in the central polar cap. This optical structure was detected with an all-sky airglow imager at Resolute Bay (74.73°N, 265.07°E) during a large magnetic storm on December 15, 2006. The absolute optical intensity of the plume was≈ 1 kR, which is much brighter than that of non-stormtime polar cap patches. Two-dimensional imaging capability of the all-sky imager demonstrates that some meso-scale structures (≈250-600 km) were embedded within the plume. Simultaneous ion density and drift measurements with the DMSP spacecraft strongly suggest that the plume was extending from the dayside as a narrow stream of dense plasma and thus is an optical manifestation of polar cap TOI. The DMSP data also implies that the possible source of the plume is a narrow stream of storm enhanced density (SED) transported from lower latitudes. The DMSP auroral particle observation demonstrates that the polar cap extremely expanded equatorward during this interval. This extreme expansion allowed the anti-sunward convection to capture plasmas within the SED and deliver them deep into the polar cap as a luminous airglow plume. This observation claims that the plasma transport from the dayside lower latitudes plays an important role in controlling the plasma environment in the polar cap ionosphere during magnetic storms.
机译：我们报告了一个异常伸长的，明亮的气辉羽流事件，该事件被认为是中央极帽中电离舌（TOI）的光学表现。在2006年12月15日的一场大磁暴期间，在坚毅海湾（74.73°N，265.07°E）上，用一架全天空气辉成像仪检测到了这种光学结构。羽流的绝对光学强度约为1 kR，这在很大程度上比非暴风雨时的极地斑块亮。全天空成像仪的二维成像能力表明，羽流中嵌入了一些中尺度结构（约250-600 km）。用DMSP航天器同时进行离子密度和漂移测量，有力地表明，烟羽以狭窄的密集等离子体流从白天开始延伸，因此是极性盖TOI的光学表现。 DMSP数据还暗示，羽流的可能来源是从较低纬度输送来的狭窄风暴增强密度（SED）流。 DMSP的极光粒子观测表明，极帽在此间隔期间向赤道方向极大扩展。这种极端的膨胀使抗对流的对流能够捕获SED中的等离子体，并将其作为发光的气辉羽流深入极性极帽。该观察结果声称，在风暴期间，来自白天低纬度的等离子体传输在控制极地顶盖电离层的等离子体环境中起着重要作用。

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