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Study of the evolution of the geomagnetic disturbances during the passage of high-speed streams from coronal holes in solar cycle 2009-2016
Astrophysics and Space Science ( IF 1.8 ) Pub Date : 2021-02-10 , DOI: 10.1007/s10509-021-03927-5
Anand Kumar , B. Badruddin

We study the geo-effectiveness of high-speed streams (HSS) detected during the consecutive eight years (2009 - 2016) period of solar cycle 24. These HSS are of different speeds and durations. During their passage, solar wind plasma and magnetic field parameters are also not similar. We utilize solar wind plasma and magnetic field parameters during the HSS passage in addition to two geomagnetic indices. Using the superposed-epoch analysis method, we study the time-evolution of geomagnetic disturbances concerning various solar wind parameters during the passage of HSS of different speeds and durations. We identify the solar wind parameter, which best follows the variations in geomagnetic parameters during the evolution of geomagnetic storms, from the start till recovery. Further, utilizing the level of geomagnetic activity due to individual HSS, we also search for solar wind parameter/function, which best correlates with the strength of geomagnetic storms due to these HSS.



中文翻译:

2009-2016年太阳周期冠状孔高速流通过过程中地磁扰动的演化研究

我们研究在太阳周期24的连续八年(2009年至2016年)期间检测到的高速流(HSS)的地球有效性。这些HSS具有不同的速度和持续时间。在通过过程中,太阳风等离子体和磁场参数也不相似。除了两个地磁指标外,我们在高速钢通行期间还利用了太阳风等离子体和磁场参数。利用叠加历元分析方法,研究了不同速度和持续时间的高速钢通过过程中与各种太阳风参数有关的地磁干扰的时间演化。我们确定了太阳风参数,该参数最能追踪地磁风暴从始至终的发展过程中地磁参数的变化。此外,利用由于个别HSS而产生的地磁活动水平,

更新日期:2021-02-10
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