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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Electrostatic potential patterns in the high-latitude ionosphere constrained by SuperDARN measurements
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Electrostatic potential patterns in the high-latitude ionosphere constrained by SuperDARN measurements

机译：SuperDARN测量限制了高纬度电离层中的静电势模式

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The recent addition of two radars to the existing network of six Super Dual Auroral Radar Network (SuperDARN) HF radars in the Northern Hemisphere has significantly extended the area in the high latitude where measurements of convecting ionospheric plasma are made. We show that the distribution of the electrostatic potential Phi associated with the "E x B" drift of ionospheric plasma can be reliably mapped on global scales when velocity measurments provide sufficient coverage. The global convection maps, or the equivalent electrostatic potential maps, are solved using an established technique of fitting velocity data to an expansion of Phi in terms of spherical harmonic functions. When the measurements are extensive, and especially when they spall the region between the extrema in the potential distribution, the solution for the global pattern becomes insensitive to the choice of statistical model data used to constrain the fitting. That is, the statistical model data then only guide the solution in regions where no measurements are available, and the details of the model data have little effect on the gross features of the large-scale convection patterns. The resulting total potential variation across the polar cap, Phi(PC) is virtually independent of the statistical model. The ability to accurately determine Phi(PC) and the global potential Phi on the basis of direct measurements is an important step in understanding solar wind-magnetosphere-ionosphere coupling. [References: 16]
机译：最近在北半球的六个超双极光雷达网络（SuperDARN）HF雷达的现有网络中增加了两个雷达，大大扩展了进行对流电离层等离子体测量的高纬度地区。我们显示，当速度测量提供足够的覆盖范围时，与电离层等离子体的“ E x B”漂移相关的静电势Phi的分布可以可靠地映射到全局尺度上。整体对流图或等效静电势图使用已建立的技术进行求解，该技术将速度数据拟合到球谐函数的Phi展开上。当进行广泛的测量时，尤其是当它们使电位分布中的极值之间的区域散裂时，整体模式的解决方案对于选择用于约束拟合的统计模型数据变得不敏感。也就是说，统计模型数据然后仅指导没有测量可用的区域中的解决方案，并且模型数据的详细信息对大规模对流模式的总体特征影响很小。跨极帽Phi（PC）的最终总电势变化实际上与统计模型无关。在直接测量的基础上准确确定Phi（PC）和全球潜力Phi的能力是理解太阳风-磁层-电离层耦合的重要一步。 [参考：16]

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