Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays

J. M. Weygand; O. Amm; V. AngelopoulosS. E. MilanA. GrocottH. GleisnerC. Stolle

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Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays

机译：对比SuperDARN向量和流动电离层电流从地面磁强计阵列

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Equivalent ionospheric currents obtained with the spherical elementary current systems (SECS) method and derived from nearly 100 ground magnetometers spread over North America and Greenland are compared with ionospheric flow vectors measured by the SuperDARN radars during both the summer and winter seasons. This comparison is done over a range of spatial separations, magnetic latitudes, magnetic local times, and auroral electrojet activity to investigate under what conditions the vectors are anti-parallel to one another. Our results show that in general the equivalent ionospheric currents are anti-parallel to the flows and the best results are achieved within the auroral oval during active geomagnetic conditions in the dawn, dusk and noon sectors in the northern hemisphere summer. These results indicate the best anti-parallel alignment occurs when the currents and flows are large and well defined. Factors that may influence the alignment include ionospheric conductivity gradients and quiet time backgrounds. Our results can be used to approximate the macroscopic (～ 1000 km) ionospheric convection patterns. The SECS maps represent a value-added product from the raw magnetometer database and can be used for contextual interpretation; they can help with our understanding of magnetosphere-ionosphere coupling mechanisms using ground arrays and the magnetospheric spacecraft data, and they can be used as input for other techniques.

机译：相当于电离层电流获得的球形小学当前系统(秒)方法和来自近100个地面磁力计在北美和传播格陵兰岛与电离层流向量衡量SuperDARN雷达中夏季和冬季的季节。比较是在一系列的空间分离、磁纬度、磁性当地次,极光电喷流活动向量是在什么条件下进行调查反向。一般来说相当于电离层流和反向电流在极光椭圆实现最好的结果在活跃的地磁黎明的条件,黄昏和中午部门在北半球夏天。反平行排列时的电流和流动是大的和良好定义的。这可能影响校准包括电离层电导率梯度和安静的时间背景。近似的宏观(~ 1000公里)电离层对流模式。代表一个从原始的增值产品磁强计,可用于数据库语境的解释;理解magnetosphere-ionosphere使用地面数组和耦合机制磁性层的航天器数据,他们可以用作其他输入技术。

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2012年第5期|A05325:1-A05325:9|共9页
作者
J. M. Weygand; O. Amm; V. AngelopoulosS. E. MilanA. GrocottH. GleisnerC. Stolle;
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作者单位

Arctic Research Unit, Finnish Meteorological Institute, Helsinki, Finland;

Atmosphere Space Research Division, Danish Meteorological Institute, Copenhagen, Denmark;

Department of Physics and Astronomy, University of Leicester, Leicester, UKDepartment of Earth and Space Sciences, UCLA, Los Angeles, California, USATechnical University of Denmark, DTU Space, Copenhagen, DenmarkInstitute of Geophysics and Planetary Physics, UCLA, Los Angeles, California, USA;

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magnetosphere-ionosphere coupling; ground magnetometer; magnetometersIONOSPHERIC CURRENTSCloning VectorsFlowauroral oval;

机译：地面magnetosphere-ionosphere耦合;磁强计;magnetometersIONOSPHERICCURRENTSCloning VectorsFlowauroral椭圆形;

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Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays

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