Response of the Ionospheric Total Electron Content During St. Patrick's Day Geomagnetic Storm in 2015 over the Philippine-Taiwan Region

Q3 Multidisciplinary
Merlin M. Mendoza, E. Macalalad
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Abstract

The ionospheric total electron content (TEC) response during the St. Patrick's Day geomagnetic storm of 2015 (max Kp = 8) is an interest of study in the field of space weather since it is the strongest geomagnetic storm of Solar Cycle 24. The cause of this storm is a coronal mass ejection (CME) from the Sun on 15 Mar 2015 recorded by SOHO/LASCO and arrived at ~ 05:00 UT 17 Mar 2015. The CME speed is estimated at ~ 668 km/s. At the initial phase of the storm, the disturbance storm time (Dst) index rose from 15 nanoteslas nT at 03:21–56 nT at 05:31 UT. The main phase of the storm caused the Dst index to drop to the minimum value of –223 nT from 05:31–22:33 UT on 17 Mar 2015. In the Philippine-Taiwan sector, TEC during the main phase was enhanced by ~ 25 TECU on 10 GNSS receiver stations and was depleted afterward with a maximum depletion of ~ 33 TECU on PBAS. The recovery phase showed a TEC depletion on all stations for the whole day. The minimum dTEC (differential TEC) is observed at PBAS (Basco, Batanes, Philippines), and the maximum percent depletion is observed at TWTF (Taoyuan, Taiwan) during the early hours of photoionization. Results from this study verified that GNSS TEC measurements along Asian sectors dropped significantly during St. Patrick's geomagnetic storm.
2015年菲律宾-台湾地区圣帕特里克节地磁风暴期间电离层总电子含量的响应
2015年圣帕特里克日地磁风暴(最大Kp = 8)期间的电离层总电子含量(TEC)响应是空间天气领域的一个研究热点,因为它是太阳周期24中最强的地磁风暴。这次风暴的起因是2015年3月15日太阳的日冕物质抛射(CME),由SOHO/LASCO记录,并于2015年3月17日05:00到达utc。CME的速度估计为668公里/秒。在风暴初始阶段,扰动风暴时间(Dst)指数从03:21 ~ 05:31的15纳米特斯拉nT上升到56纳米特斯拉nT。在2015年3月17日05:31-22:33 UT期间,风暴主阶段导致Dst指数降至最小值-223 nT。在菲律宾-台湾扇区,在主阶段,10个GNSS接收站的TEC增强了~ 25 TECU,随后在PBAS上耗尽了~ 33 TECU。恢复阶段显示全天所有台站的TEC耗尽。在PBAS (Basco, Batanes,菲律宾)观察到最小的dTEC(微分TEC),在TWTF(桃园,台湾)观察到最大的损耗百分比在光电离的早期。本研究结果证实,在圣帕特里克地磁风暴期间,沿亚洲扇区的GNSS TEC测量值显著下降。
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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来源期刊
Philippine Journal of Science
Philippine Journal of Science Multidisciplinary-Multidisciplinary
CiteScore
1.20
自引率
0.00%
发文量
55
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