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Direct Observations of the Evolution of Polar Cap Ionization Patches

【标题】Direct Observations of the Evolution of Polar Cap Ionization Patches

【Title】Direct Observations of the Evolution of Polar Cap Ionization Patches

【DOI】10.1126/science.1231487

【作者】 张清和; 张北辰; Michael Lockwood; 胡红桥; 杨惠根; 刘瑞源

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

【期刊】Science

【Journal】Science

【期刊年份】2013

【卷】339

【期】1597

【关键词】

【Keywords】

【摘要】Patches of ionization are common in the polar ionosphere, where their motion and associated density gradients give variable disturbances to high-frequency (HF) radio communications, over-the-horizon radar location errors, and disruption and errors to satellite navigation and communication. Their formation and evolution are poorly understood, particularly under disturbed space weather conditions. We report direct observations of the full evolution of patches during a geomagnetic storm, including formation, polar cap entry, transpolar evolution, polar cap exit, and sunward return flow. Our observations show that modulation of nightside reconnection in the substorm cycle of the magnetosphere helps form the gaps between patches where steady convection would give a “tongue” of ionization (TOI).

【Abstract】Patches of ionization are common in the polar ionosphere, where their motion and associated density gradients give variable disturbances to high-frequency (HF) radio communications, over-the-horizon radar location errors, and disruption and errors to satellite navigation and communication. Their formation and evolution are poorly understood, particularly under disturbed space weather conditions. We report direct observations of the full evolution of patches during a geomagnetic storm, including formation, polar cap entry, transpolar evolution, polar cap exit, and sunward return flow. Our observations show that modulation of nightside reconnection in the substorm cycle of the magnetosphere helps form the gaps between patches where steady convection would give a “tongue” of ionization (TOI).

【基金/项目】 National Basic Research Program (grant 2012CB825603) ; 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 ; 极区海洋大气与空间环境业务化监测及其在气候变化预测中的应用(地球极区太阳风能量注入过程与模式)

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