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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >On the generation/decay of the storm-enhanced density plumes: Role of the convection flow and field-aligned ion flow
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On the generation/decay of the storm-enhanced density plumes: Role of the convection flow and field-aligned ion flow

机译：代/ storm-enhanced的衰变密度羽毛:对流流和角色field-aligned离子流

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摘要

Storm-enhanced density (SED) plumes are prominent ionospheric electron density increases at the dayside middle and high latitudes. The generation and decay mechanisms of the plumes are still not clear. We present observations of SED plumes during six storms between 2010 and 2013 and comprehensively analyze the associated ionospheric parameters within the plumes, including vertical ion flow, field-aligned ion flow and flux, plasma temperature, and field-aligned currents, obtained from multiple instruments, including GPS total electron content (TEC), Poker Flat Incoherent Scatter Radar (PFISR), Super Dual Auroral Radar Network, and Active Magnetosphere and Planetary Electrodynamics Response Experiment. The TEC increase within the SED plumes at the PFISR site can be 1.4–5.5 times their quiet time value. The plumes are usually associated with northwestward E × B flows ranging from a couple of hundred ms~(-1) to>1 kms~(-1). Upward vertical flows due to the projection of these E × B drifts are mainly responsible for lifting the plasma in sunlit regions to higher altitude and thus leading to plume density enhancement. The upward vertical flows near the poleward part of the plumes are more persistent, while those near the equatorward part are more patchy. In addition, the plumes can be collocated with either upward or downward field-aligned currents (FACs) but are usually observed equatorward of the peak of the Region 1 upward FAC, suggesting that the northwestward flows collocated with plumes can be either subauroral or auroral flows. Furthermore, during the decay phase of the plume, large downward ion flows, as large as ~200ms~(-1), and downward fluxes, as large as 10~(14)m~(-2) s~(-1), are often observed within the plumes. In our study of six storms, enhanced ambipolar diffusion due to an elevated pressure gradient is able to explain two of the four large downward flow/flux cases, but this mechanism is not sufficient for the other two cases where the flows are of larger magnitude. For the latter two cases, enhanced poleward thermospheric wind is suggested to be another mechanism for pushing the plasma downward along the field line. These downward flows should be an important mechanism for the decay of the SED plumes.
机译：Storm-enhanced密度(SED)羽毛突出电离层电子密度的增加中间的光面和高纬度地区。和气流的衰变机制仍然不是明确的。在六个风暴在2010年和2013年之间全面分析相关的电离层参数在羽毛,包括垂直离子流,field-aligned离子等离子体温度和流动和变化field-aligned电流,获得来自多个仪器,包括GPS总电子含量(TEC),扑克平坦的非相干散射雷达(PFISR),超级双极光雷达网络,活跃的磁气圈和行星电动力学响应实验。增加在SED PFISR站点上的羽毛可以安静的时间值的1.4 - -5.5倍。羽毛通常与西北方E×B流从几百~(1) > 1公里~女士(1)。的投影这些E×B飘主要负责等离子体的提升阳光照射的区域更高的高度,因此导致柱密度的提高。向极附近的垂直流的一部分羽毛更持久,而附近朝赤道方向更不完整的一部分。羽毛可以搭配上向上向上或向下field-aligned电流(流式细胞仪),但通常观察到朝赤道方向的峰值区域1向上FAC,暗示向西北流与羽毛可以配置subauroral或极光流动。羽在衰退阶段,大向下离子流动,一样大~ 200 ms ~ (1)下行流量,大如10 ~ (14)m ~ (2)s ~(1),经常观察到在羽流。我们研究的六个风暴,增强的双极性由于高架压力梯度扩散能够解释的两个四大下行流/流量情况下,但这种机制不是足够的其他两种情况下流的更大的规模。情况下,增强向极thermospheric风建议是另一个机制来推动等离子体向下沿磁场线。向下流动应该是一个重要的机制衰变的SED羽流。

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