A large‐scale traveling ionospheric disturbance during the magnetic storm of 15 September 1999
A large‐scale traveling ionospheric disturbance during the magnetic storm of 15 September 1999
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DOI：
10.1029/2001ja000245
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发表时间：
2002-06
影响因子：
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通讯作者：
K. Shiokawa;Y. Otsuka;T. Ogawa;N. Balan;K. Igarashi;A. Ridley;D. Knipp;A. Saito;K. Yumoto
中科院分区：
文献类型：
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作者：
K. Shiokawa;Y. Otsuka;T. Ogawa;N. Balan;K. Igarashi;A. Ridley;D. Knipp;A. Saito;K. Yumoto
GPS总电子含量（？1.0？10？16 m？2）增强。这些参数的多点和成像观测表明，LSTID以400-450 m/s的速度在日本上空向赤道移动。通过与谢菲尔德大学等离子体层-电离层模式（SUPIM）的比较，我们得出结论：向极中性风的增强（250-300 m/s）（即向赤道传播）导致了中纬度LSTID的这些观测特征。为了研究极光能量输入产生的LSTID，我们使用了极地UVI仪器获得的极光图像，在多点地面站获得的磁场变化，以及电离层电动力学同化映射（AMIE）技术计算的经验焦耳加热率。强烈的极光能量输入在0800-1100 UT（LSTID前4-6小时）被观测到，可能导致低纬度的赤道中性风。这是可能的，极向风脉冲，导致所观察到的LSTID的产生与此赤道风的停止。还讨论了洛伦兹力的影响。索引术语：0310大气组成和结构：气辉和极光; 2427电离层：电离层/大气相互作用（0335）; 2435电离层：电离层扰动; 2437电离层：电离层动力学; 2788磁层物理：风暴和亚暴;关键词：大尺度移动电离层扰动，热层-电离层耦合，磁暴，气辉成像，GPS网络，电离层探测仪
enhancement of GPS total electron content (� 1.0 � 10 16 m � 2 ). Multipoint and imaging observations of these parameters show that the LSTID moved equatorward over Japan with a velocity of � 400–450 m/s. From a comparison with the Sheffield University Plasmasphere-Ionosphere Model (SUPIM) we conclude that an enhancement (250–300 m/s) of poleward neutral wind (that is propagating equatorward) caused these observational features of the LSTID at midlatitudes. To investigate generation of the LSTID by auroral energy input, we have used auroral images obtained by the Polar UVI instrument, magnetic field variations obtained at multipoint ground stations, and the empirical Joule heating rate calculated by the assimilative mapping of ionospheric electrodynamics (AMIE) technique. Intense auroral energy input was observed at 0800–1100 UT (4–6 hours before the LSTID), probably causing equatorward neutral wind at lower latitudes. It is likely that the poleward wind pulse that caused the observed LSTID was generated associated with the cessation of this equatorward wind. The effect of Lorentz force is also discussed. INDEX TERMS: 0310 Atmospheric Composition and Structure: Airglow and aurora; 2427 Ionosphere: Ionosphere/atmosphere interactions (0335); 2435 Ionosphere: Ionospheric disturbances; 2437 Ionosphere: Ionospheric dynamics; 2788 Magnetospheric Physics: Storms and substorms; KEYWORDS: large-scale traveling ionospheric disturbance, thermosphere–ionosphere coupling, magnetic storm, airglow imaging, GPS network, ionosonde