Combining incoherent scatter radar data and IRI-2007 to monitor the open-closed field line boundary during substorms

Combining incoherent scatter radar data and IRI-2007 to monitor the open-closed field line boundary during substorms
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结合非相干散射雷达数据和IRI-2007监测亚暴期间的开闭场线边界

DOI:
10.1029/2010ja015751
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发表时间:
2010
期刊:
Space Physics
影响因子:
--
通讯作者:
Woodfield E
Woodfield E
中科院分区:
--
文献类型:
--
作者:
Woodfield E

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极冠的大小对于理解亚暴过程以及一般的重连率是非常重要的。在这项工作中,我们建立在以前的研究基础上,这些研究使用欧洲非相干散射雷达(EISCAT)电子温度(Te)测量的组合,同时运行两个雷达来跟踪开闭场线边界(OCB)的运动。第二个雷达给出了随高度的背景变化的估计,然后可以从用于估计OCB位置的雷达波束中减去。我们证明,使用国际参考电离层2007(IRI‐2007)模型可以删除第二个雷达的要求,因此增加的情况下,可以受益于backgroundTessubtraction。在本文中,我们集中我们的分析亚暴间隔。我们发现,IRI-2007方法产生的OCB代理位置平均为0.25°高度调整校正的地磁坐标纬度赤道的双雷达方法。在比较两个雷达和IRI-2007 TeOCB发现方法与DMSP粒子数据和IMAGE卫星数据中确定的OCB时,我们发现两种EISCAT方法都表现得很好,并且没有一种方法特别优于另一种方法。我们发现IMAGE OCB的平均偏移量在0.1°和2.7°纬度之间变化,取决于事件和所使用的IMAGE相机。
The size of the polar cap is very important for understanding the substorm process as well as reconnection rates in general. In this work we build on previous studies which use a combination of European Incoherent Scatter radar (EISCAT) electron temperature (Te) measurements from two radars running simultaneously to track the motion of the open‐closed field line boundary (OCB). The second radar gives an estimate of the background variation ofTewith altitude, which can then be subtracted from the radar beam being used to estimate the OCB location. We demonstrate that using the international reference ionosphere 2007 (IRI‐2007) model can remove the second radar requirement and therefore increase the number of cases which could benefit from backgroundTesubtraction. In this paper we focus our analysis on substorm intervals. We find that the IRI‐2007 method produces an OCB proxy location which on average is 0.25° altitude adjusted corrected geomagnetic coordinate latitude equatorward of the two‐radar method. On comparing both the two‐radar and IRI‐2007TeOCB finding methods with the OCB identified in the DMSP particle data and IMAGE satellite data we find that both EISCAT methods perform quite well, and neither method is particularly favored over the other. We find that the magnitude of the mean offset to the IMAGE OCB varies between 0.1° and 2.7° latitude, dependent on the event and the IMAGE camera used.
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