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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A comparison of Cluster magnetic data with the Tsyganenko 2001 model
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A comparison of Cluster magnetic data with the Tsyganenko 2001 model

机译:一个集群磁数据的比较

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As part of an investigation of the magnetic effects of external currents in the magnetosphere, we have compared two years of perigee Cluster data to the Tsyganenko 2001 (T01) field model. Cluster data are not included in the T01 database and therefore can be used to independently verify the model. The model performs very well in a global sense; nevertheless, absolute residuals between the data and the model can reach ~20 nT near perigee. These deviations take two forms: a sharp, bipolar signature and well-defined trends over a larger spatial region. The bipolar signatures in the residuals are moderately stable, repeating on the phase period of the Cluster orbit. The bipolar nature of the signatures reflects variations in the Cluster data, therefore indicating that the spacecraft may be observing a field-aligned current. Although the size of the magnetic field perturbation in this region is not well determined by T01, the location of the observed field-aligned current system is accurately predicted. The bipolar signatures are observed in close proximity to the edge of the ring current, estimated from Cluster energetic electron spectrograms, indicating that they are associated with region 2 field-aligned currents. Longer-duration trends in the residuals indicate a slight difference between the model predictions and the Cluster data for various locations and seasons. For example, throughout most of 2003 and the first half of 2004, there is a residual in the total magnetic field for an hour centered on perigee, of ~20 nT.
机译:作为调查的一部分,磁性外部电流的影响磁气圈,而两年的近地点集群数据Tsyganenko 2001 (T01)领域模型。T01数据库,因此可以使用独立验证模型。全球意义上的执行很好;然而,绝对残差之间的数据和模型可以达到近地点附近~ 20元。这些偏差采取两种形式:一把锋利,双相在一个更大的签名和明确的趋势空间区域。残差是比较稳定的,在重复阶段的集群轨道。签名的性质反映了变化集群的数据,因此表明宇宙飞船可以观察field-aligned电流。扰动在这个区域不是很好由T01,观察到的位置field-aligned当前系统是准确的预测。靠近边缘的电流环,估计从集群高能电子色,这表明它们是相关的区域2 field-aligned电流。在残差表示较长期趋势模型的预测略有区别为各种位置和和集群数据季节。2004年上半年,有剩余的总磁场集中在一个小时近地点,~ 20元。

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