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Chain of responses of geomagnetic and ionospheric storms to a bunch of central coronal hole and high speed stream of solar wind
Journal of Atmospheric and Solar-Terrestrial Physics ( IF 1.9 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jastp.2020.105380
T.L. Gulyaeva , R.A. Gulyaev

Abstract Results of analysis of the proxy of Coronal Hole (CH) Power index, Pch, combined with the high speed streams HSS of solar wind for a period from 2011 to 2019 are presented. It is found that the long-term variation of Pch index shows a trend of growing Pch towards the minimum of solar cycle while most of other identities of solar activity tend to diminish. Superposition of fast solar wind of CH origin with slow SW of CME's origin synchronized with SC explains increasing/decreasing solar wind speed Vsw at L1 point. Total 136 geo-effective Pch/HSS storms are selected with 4 criteria: (1) 3-day increment ΔPch ≥ 90 i.u. where ΔPch = Pch(1d_dmax) – Pch(-3d_dmin); (2) the Pch event is consistent with data of VizieR catalogue of CHs; (3) during 1–4 days after Pch(1d_dmax) the jump of HSS solar wind speed ΔVsw exceeds 50 km/s where ΔVsw = Vswmax(t0 + Δt) - Vswmin(t0) for running time window Δt ≤ 24 h; (4) index kp ≥ 3 occurs during 48 h after zero time t0. Example of moderate storm on 27–28 September 2019, is provided to illustrate Pch/HSS related storm. The superposed epoch analysis is applied to the solar wind speed Vsw, geomagnetic AE, AU, AL, aa, ap, kp, Dst indices and planetary ionosphere TEC-based Wp index during time t0-24 h ≤ t

中文翻译:

地磁和电离层风暴对一堆中央日冕洞和太阳风高速流的响应链

摘要 介绍了 2011 年至 2019 年期间日冕孔 (CH) 功率指数 Pch 的代理分析结果,并结合了太阳风的高速流 HSS。发现Pch指数的长期变化显示出Pch向太阳活动周期的最小值增加的趋势,而大多数其他太阳活动标识则趋于减弱。CH 源的快速太阳风与 CME 源的慢 SW 与 SC 同步的叠加解释了 L1 点太阳风速 Vsw 的增加/减少。总共有 136 个地球有效 Pch/HSS 风暴是根据 4 个标准选择的:(1) 3 天增量 ΔPch ≥ 90 iu,其中 ΔPch = Pch(1d_dmax) – Pch(-3d_dmin);(2) Pch事件与CHs的VizieR目录数据一致;(3) Pch(1d_dmax)后1-4天HSS太阳风速跃变ΔVsw超过50km/s,其中ΔVsw = Vswmax(t0 + Δt) - Vswmin(t0),运行时间窗口Δt≤24 h;(4) 指数 kp ≥ 3 发生在零时间 t0 后的 48 小时内。提供了 2019 年 9 月 27-28 日的中等风暴示例,以说明与 Pch/HSS 相关的风暴。叠加历元分析应用于时间 t0-24 h ≤ t 期间的太阳风速 Vsw、地磁 AE、AU、AL、aa、ap、kp、Dst 指数和基于行星电离层 TEC 的 Wp 指数
更新日期:2020-10-01
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