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Solar wind high-speed streams and related geomagnetic activity in the declining phase of solar cycle 23

机译:太阳周期下降阶段的太阳风高速流和相关的地磁活动23

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Context. Coronal holes (CHs) are the source of high-speed streams (HSSs) in the solar wind, whose interaction with the slow solar wind creates corotating interaction regions (CIRs) in the heliosphere. Aims. We investigate the magnetospheric activity caused by CIR/HSS structures, focusing on the declining phase of the solar cycle?23 (years 2005 and 2006), when the occurrence rate of coronal mass ejections (CMEs) was low. We aim to (i) perform a systematic analysis of the relationship between the CH characteristics, basic parameters of HSS/CIRs, and the geomagnetic indices Dst, Ap and AE; (ii) study how the magnetospheric/ionospheric current systems behave when influenced by HSS/CIR; (iii) investigate if and how the evolution of the background solar wind from 2005 to 2006 affected the correlations between CH, CIR, and geomagnetic parameters. Methods. The cross-correlation analysis was applied to the fractional CH area (CH) measured in the central meridian distance interval ?±?10°, the solar wind velocity (V), the interplanetary magnetic field (B), and the geomagnetic indices Dst, Ap, and AE. Results. The performed analysis shows that Ap and AE are better correlated with CH and solar wind parameters than Dst, and quantitatively demonstrates that the combination of solar wind parameters BV2 and BV plays the central role in the process of energy transfer from the solar wind to the magnetosphere. Conclusions. We provide reliable relationships between CH properties, HSS/CIR parameters, and geomagnetic indices, which can be used in forecasting the geomagnetic activity in periods of low CME activity.
机译:上下文。日冕洞(CHs)是太阳风中高速流(HSS)的来源,其与慢速太阳风的相互作用在日光层中产生了同向相互作用区域(CIR)。目的我们研究了由CIR / HSS结构引起的磁层活动,重点是太阳冕周期的下降阶段(23年(2005年和2006年)),当时日冕物质抛射(CMEs)的发生率较低。我们旨在(i)对CH特性,HSS / CIR的基本参数以及地磁指数Dst,Ap和AE之间的关系进行系统的分析; (ii)研究受高速钢/ CIR影响的磁层/电离层电流系统的行为; (iii)研究2005年至2006年背景太阳风的演变是否以及如何影响CH,CIR和地磁参数之间的相关性。方法。将互相关分析应用于以中央子午线距离间隔±±10°,太阳风速(V),行星际磁场(B)和地磁指数Dst测得的CH分数(CH), Ap和AE。结果。进行的分析表明,与Dst相比,Ap和AE与CH和太阳风参数的相关性更好,并且定量地证明了太阳风参数BV2和BV的组合在从太阳风向磁层的能量转移过程中起着核心作用。 。结论。我们提供了CH属性,HSS / CIR参数和地磁指数之间的可靠关系,可将其用于预测低CME活动期间的地磁活动。

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