Ionospheric variations during geomagnetic storms of 7–8 September, 2017

Barsha Dutta, Rumajyoti Hazarika, B. R. Kalita, K. Bhuyan, P. Bhuyan, Aditi Pandey, Adrika Kakoty
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Abstract

Two very intense solar flares of magnitudes X2.2 and X9.3 erupted on September 6, 2017 at 09:10 UT and 12:02 UT triggering large space weather modulations on earth. We analyze the ionospheric response to the geomagnetic storm event that occurred post the flares on 7–8 September 2017 on five selected stations in the northern (Lhasa, Lucknow, Dibrugarh, Quezon City) and southern hemisphere (Cocos). This storm occurred just after the X9.3 solar flare on 6th September. The following figure represents the effect of the storm on Vertical Total Electron Content. It is seen that the VTEC increased significantly on 6-7 September in the northern hemisphere while TEC remained nearly uniform in the southern hemisphere. The TEC decreased on 8–10 September in the NH while in the SH, TEC decreased on 9th and then increased on 10th onwards. There is a sudden risein the average VTEC on 11th September more than pre flare levels in all stations. Ionograms obtained over Cocos showed that for the solar flare day E layer disappears whereas, for geomagnetic storm days sporadic E is observed. The inter hemispheric asymmetric variation in TEC and E layer activities over Cocos are further examined using electron density profiles, maximum electron concentration (NmF2) and data from COSMIC, GRACE and SWARM satellites. The results from this comprehensive analysis will be presented.
2017年9月7-8日地磁暴期间电离层变化
2017年9月6日9时10分和12时02分,两次强度为X2.2和X9.3的强烈太阳耀斑爆发,引发了地球上的大空间天气调制。我们选取了北半球(拉萨、勒克瑙、迪布鲁加尔、奎松市)和南半球(科科斯)的5个站点,分析了2017年9月7-8日耀斑后地磁风暴事件对电离层的响应。这场风暴发生在9月6日X9.3太阳耀斑之后。下图表示了风暴对垂直总电子含量的影响。从图中可以看出,9月6日至7日,北半球的VTEC显著增加,而南半球的TEC基本保持不变。9月8-10日,北半球TEC呈下降趋势,而北半球TEC在9日先下降后上升。9月11日所有站点的平均VTEC突然上升,高于耀斑爆发前的水平。在Cocos上获得的电离图显示,在太阳耀斑日E层消失,而在地磁风暴日则观测到零星的E层。利用电子密度剖面、最大电子浓度(NmF2)和COSMIC、GRACE和SWARM卫星的数据进一步研究了Cocos上空TEC和E层活动的半球间不对称变化。本文将介绍这一综合分析的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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