Influence of precipitating energetic ions caused by EMIC waves on the subauroral ionospheric E region during a geomagnetic storm
Influence of precipitating energetic ions caused by EMIC waves on the subauroral ionospheric E region during a geomagnetic storm
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DOI：
10.1002/2014ja020303
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发表时间：
2014-10
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影响因子：
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通讯作者：
Z. Yuan;Y. Xiong;Haimeng Li;Shiyong Huang;Zheng Qiao;Zhenzhen Wang;Meng Zhou;Dedong Wang;Xiaohua Deng;T. Raita;Jingfang Wang
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文献类型：
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作者：
Z. Yuan;Y. Xiong;Haimeng Li;Shiyong Huang;Zheng Qiao;Zhenzhen Wang;Meng Zhou;Dedong Wang;Xiaohua Deng;T. Raita;Jingfang Wang
利用位于芬兰瓦萨（瓦萨）的极轨环境卫星（POES）气象业务站（METOP-02）、GPS接收机和芬兰搜索线圈磁强计网络的观测资料，研究了2008年3月8日磁暴期间电磁离子回旋（EMIC）波引起的高能离子沉降对极光下电离层E区的影响。POES METOP-02卫星和芬兰搜索线圈磁力计网络的共轭观测表明，质子各向异性区内沉淀高能离子通量的增强归因于环电流（RC）离子和EMIC波之间的相互作用。随着探测线圈磁强计观测到的Pc 1波强度的增强，GPS接收机观测到的总电子含量也相应增加，这意味着电离层电子密度的增强归因于EMIC波引起的RC离子的沉淀。由国际参考电离层（IRI-2007）模型和POES METOP-02卫星观测到的高能质子沉淀得出的电子密度分布表明，高能质子沉淀可以导致E层峰值电子密度从1.62 × 109 m−3增加到5.05 × 1011 m−3，增加了2.49个数量级。与由IRI-2007模型导出的高度积分电导率相比，由沉淀高能质子导出的高度积分Pedersen和Hall电导率分别增加了2.4和2.34个数量级。结果表明，在磁暴期间，EMIC波引起的高能离子沉降可导致极光下电离层E区电子密度和电导率的明显增强。
In this paper, we have presented the influence of precipitating energetic ions caused by electromagnetic ion cyclotron (EMIC) waves on the subauroral ionospheric E region during a geomagnetic storm on 8 March 2008 with observations of the Meteorological Operational (METOP‐02) of the Polar Orbiting Environmental Satellites (POES), a GPS receiver in Vaasa of Finland and Finnish network of search coil magnetometers. Conjugate observations of the POES METOP‐02 satellite and Finnish network of search coil magnetometers have demonstrated that enhancements of the precipitating energetic ion flux within the proton anisotropic zone are attributed to the interaction between ring current (RC) ions and EMIC waves. With enhancements of the intensity of Pc1 waves observed by search coil magnetometers, the total electron content observed by the GPS receiver accordingly increased, meaning that the enhancement of the ionospheric electron density is attributed to the precipitation of RC ions caused by EMIC waves. The electron density profiles derived by the International Reference Ionosphere (IRI‐2007) model and with precipitating energetic protons observed by the POES METOP‐02 satellite show that the energetic proton precipitation can cause the E layer peak electron density to increase from 1.62 × 109 m−3 to 5.05 × 1011 m−3 by 2.49 orders of magnitude. In comparison with the height‐integrated conductivities derived by the IRI‐2007 model, the height‐integrated Pedersen and Hall conductivities derived with precipitating energetic protons increase by 2.4 and 2.34 orders of magnitude, respectively. Our result suggests that precipitating energetic ions caused by EMIC waves can lead to an obvious enhancement of the electron density and conductivities in the subauroral ionospheric E region during geomagnetic storms.