Equatorial and low-latitude ionospheric response to the 17-18 March 2015 great storm over Southeast Asia longitude sector
Equatorial and low-latitude ionospheric response to the 17-18 March 2015 great storm over Southeast Asia longitude sector
复制标题
赤道和低纬度电离层对2015年3月17日至18日东南亚经度区大风暴的响应
DOI：
10.1002/2017ja024134
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发表时间：
2017
影响因子：
2.8
通讯作者：
Yatini Clara Y
中科院分区：
文献类型：
--
作者：
Jiang Chunhua;Yang Guobin;Liu Jing;Yokoyama Tatsuhiro;Liu Tongxin;Lan Ting;Zhou Chen;Zhang Yuannong;Zhao Zhengyu;Komolmis Tharadol;Supnithi Pornchai;Yatini Clara Y
本研究主要研究赤道和低纬电离层对2015年3月17日发生的大磁暴的响应。我们发现了一些有趣的电离层现象，例如，电离层正效应、白天扩展F和上午赤道电离异常（EIA）出现在沿着100°E左右的赤道和低纬地区。地面电离层探测仪和原位卫星（Swarm）被用来研究这些电离层现象的可能机制。研究发现，电离层扰动（TID）或大气扰动（TADs）引起的等离子体或中性粒子的垂直向下输运可能对这次强风暴主阶段的短期电离层正效应有贡献。另外，低纬地区白天扩散的发生可能是由于赤道电离层不规则体在顶侧电离层沿着地磁场线扩散的结果。此外，观测证据表明，TID也可能是Swarm B卫星在顶侧电离层记录的早晨EIA样特征的主要驱动因素。这些电离层现象可以使我们更好地了解赤道和低纬地区的电离层暴效应。
This study mainly investigates equatorial and low‐latitude ionospheric response to a great geomagnetic storm that occurred on 17 March 2015. We found that there were some interesting ionospheric phenomena, e.g., short‐term ionospheric positive effect, daytime spreadF, and morning Equatorial Ionization Anomaly (EIA) in the topside ionosphere, emerged at equatorial and low‐latitude region along the longitude of about 100°E. Ground‐based ionosondes and in situ satellite (Swarm) were utilized to study the possible mechanisms for these ionospheric phenomena. We found that vertical downward transport of plasma or neutral induced by traveling ionospheric disturbances (TIDs) or traveling atmospheric disturbances (TADs) might make a contribution to the short‐term ionospheric positive effect at the main stage of this great storm. Additionally, results suggested that the occurrence of daytime spreadFat low latitudes might be due to the diffusion of equatorial ionospheric irregularities in the topside ionosphere along geomagnetic field lines. Moreover, observational evidence shows that TIDs also might be the main driver for morning EIA‐like feature recorded by Swarm B satellite in the topside ionosphere. These ionospheric phenomena mentioned above could make us gain a better understanding of ionospheric storm effects at equatorial and low‐latitude region.