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Polar cap patch segmentation of the tongue of ionization in the morning convection cell

【标题】Polar cap patch segmentation of the tongue of ionization in the morning convection cell

【Title】Polar cap patch segmentation of the tongue of ionization in the morning convection cell

【DOI】10.1002/grl.50616

【作者】 张清和; 张北辰; 杨惠根; 胡红桥; 刘瑞源

【Author】 Zhang Qinghe ; Zhang Beichen ; Yang Huigen ; Hu Hongqiao ; Liu Ruiyuan

【期刊】地球物理研究快报

【Journal】Geophysical Research Letters

【期刊年份】2013

【卷】40

【期】12

【关键词】

【Keywords】 Polar cap patches; tongue of ionization; poleward-moving plasma concentration enhancements

【摘要】Two types of poleward moving plasma concentration enhancements (PMPCEs) were observed during a sequence of pulsed reconnection events, both in the morning convection cell: Type L (low density) was associated with a cusp flow channel and seems likely to have been produced by ionization associated with particle precipitation, while Type H (high density) appeared to originate from the segmentation of the tongue of ionization by the processes which produced the Type L events. As a result, the Type L and Type H PMPCEs were interspersed, producing a complex density structure which underlines the importance of cusp flow channels as a mechanism for segmenting and structuring electron density in the cusp and shows the necessity of differentiating between at least two classes of electron density patches.

【Abstract】Two types of poleward moving plasma concentration enhancements (PMPCEs) were observed during a sequence of pulsed reconnection events, both in the morning convection cell: Type L (low density) was associated with a cusp flow channel and seems likely to have been produced by ionization associated with particle precipitation, while Type H (high density) appeared to originate from the segmentation of the tongue of ionization by the processes which produced the Type L events. As a result, the Type L and Type H PMPCEs were interspersed, producing a complex density structure which underlines the importance of cusp flow channels as a mechanism for segmenting and structuring electron density in the cusp and shows the necessity of differentiating between at least two classes of electron density patches.

【基金/项目】 the National Basic Research Program of China (grant 2012CB825603) ; 海洋公益性行业科研专项经费项目(201005017) ; 极区电离层等离子体块的形成机制和演化特征研究 ; 极区电离层对日侧磁重联的响应研究 ; 日侧冕状极光的分类及其产生机制研究 ; 极区能量沉积过程及其对120E子午面电离层影响的研究 ; 中英合作极区电离层不均匀体特性研究

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