Interplanetary Signatures during the 1972 Early August Solar Storms
Interplanetary Signatures during the 1972 Early August Solar Storms
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DOI：
10.3847/1538-4357/acf9fd
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发表时间：
2023-11
期刊：
影响因子：
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通讯作者：
C. Cid;E. Saiz;M. Flores-Soriano;D. Knipp
中科院分区：
文献类型：
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作者：
C. Cid;E. Saiz;M. Flores-Soriano;D. Knipp
1972年8月初，在日球层观测到了一系列的行星际激波，辐射强度从0.8到2.2 Au。这些冲击归因于一系列明亮的耀斑和等离子云，因为当时科学界还不知道日冕物质抛射（CME）及其行星际对应物（ICME）。本文旨在根据目前对行星际瞬变的理解重新解释行星际数据，并利用先驱者9号和10号航天器的对准跟踪ICME的演变。为此，我们重新分析了来自这两个先驱者的原位数据，以及来自Heos，Prognoz 1和2以及探索者41号航天器搜索ICME和高速流的数据。然后，我们收集行星际瞬变和太阳活动，并分析通过日光层的喷射传播。利用多点观测资料，跟踪了低纬冕洞四个ICME和一个高速流的演化过程。前三个ICME在行星际介质中显示出明显的ICME-ICME相互作用的特征，这表明ICME发展成为鞘内ICME的第一次观测。对于未扰动的ICME事件，我们得到了与ICME局部膨胀有关的演化参数，先锋9（ε = 0.80）和先锋10（ε = 0.78）得到了类似的值。这些结果支持了先前的发现，即太阳的磁场强度与日心距离无关，并且磁场强度随r −2 <$的减小而减小。
In 1972, early August, a series of interplanetary shocks were observed in the heliosphere from 0.8 to 2.2 au. These shocks were attributed to a series of brilliant flares and plasma clouds since at that time coronal mass ejections (CMEs) and their interplanetary counterparts (ICMEs) were unknown to the scientific community. This paper aims to reinterpret the interplanetary data in light of the current understanding about interplanetary transients and to track the evolution of the ICMEs, taking advantage of the alignment of Pioneers 9 and 10 spacecraft. For this purpose, we reanalyze in situ data from these two Pioneers and also from Heos, Prognoz 1 and 2, and Explorer 41 spacecraft searching for ICMEs and high-speed streams. Then we assemble the interplanetary transients and solar activity and analyze the propagation of the ejections through the heliosphere. The evolution of four ICMEs and a high-speed stream from a low-latitude coronal hole is followed using the multipoint in situ observations. The first three ICMEs show clear signatures of ICME–ICME interaction in the interplanetary medium, suggesting the first observations of an ICME which developed into an ICME-in-the-sheath. For a non-perturbed ICME event, we obtain the evolution parameter, ζ, related to the local expansion of ICMEs, getting similar values for Pioneer 9 (ζ = 0.80) and Pioneer 10 (ζ = 0.78). These results support previous findings of ζ being independent of the heliocentric distance and the magnetic field strength decreasing as r −2ζ .