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arXiv 2008.10265astro-ph.SRphysics.space-ph
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2008-2014年孤立的行星际日冕物质抛射的日地观测和特征

Sun-to-Earth Observations and Characteristics of Isolated Earth-Impacting Interplanetary Coronal Mass Ejections During 2008-2014

Darije Maričić, Bojan Vršnak, Astrid Veronig, Mateja Dumbović, Filip Šterc, Dragan Roša, Mile Karlica, Damir Hržina, Ivan Romštajn

摘要:

分析了2008年1月至2014年8月期间发生的孤立的撞击地球ICME样本,以详细研究与相应CME相关的灯丝喷发类型有关的ICME原位特征。对于地球定向日冕物质抛射,使用STEREO-A、B COR 1和COR 2日冕仪和日光层成像仪HI 1进行了运动学研究。基于外推的日冕物质抛射运动学,我们确定了相互作用的日冕物质抛射,这被排除在进一步的分析之外。应用这种方法,一组31个孤立的地球撞击日冕物质抛射明确确定,并与现场测量记录的风航天器。我们将这些事件按日冕物质抛射源的位置和相关的暗条喷发类型分为不同的子集。因此,事件被分为三个子样本:活动区(AR)CME,消失的灯丝(DSF)CME和隐形CME。相关的三组ICME进一步分为两个子集:磁障碍(MO)事件(其中四个是隐形的),包括至少部分暴露通量绳特征的ICME,以及喷出物(EJ)事件,没有显示出这些特征。在下一步中,MO事件进行了更详细的分析,考虑到磁场强度和等离子体特性在三个不同的部分ICME,定义为湍流鞘(TS),锋区(FR),和MO本身。分析揭示了AR,DSF和隐形ICME的各种定义明确的相关性,我们考虑基本的物理概念对其进行了解释。我们的研究结果支持这一假设,ICME显示不同的签名取决于在原地航天器的轨迹,在顶点与侧翼命中。

英文摘要:

A sample of isolated Earth-impacting ICMEs that occurred in the period January 2008 to August 2014 is analysed in order to study in detail the ICME in situ signatures with respect to the type of filament eruption related to the corresponding CME. For Earth-directed CMEs, a kinematical study was performed using the STEREO-A, B COR1 and COR2 coronagraphs and the Heliospheric Imagers HI1. Based on the extrapolated CME kinematics, we identified interacting CMEs, which were excluded from further analysis. Applying this approach, a set of 31 isolated Earth-impacting CMEs was unambiguously identified and related to the in situ measurements recorded by the Wind spacecraft. We classified the events into subsets with respect to the CME source location as well as with respect to the type of the associated filament eruption. Hence, the events are divided into three subsamples: active region (AR) CMEs, disappearing filament (DSF) CMEs, and stealthy CMEs. The related three groups of ICMEs were further divided into two subsets: magnetic obstacle (MO) events (out of which four were stealthy), covering ICMEs that at least partly expose characteristics of flux ropes, and ejecta (EJ) events, not showing such characteristics. In the next step, MO-events were analysed in more detail, considering the magnetic field strengths and the plasma characteristics in three different segments of the ICMEs, defined as the turbulent sheath (TS), the frontal region (FR), and the MO itself. The analysis revealed various well-defined correlations for AR, DSF, and stealthy ICMEs, which we interpreted considering basic physical concepts. Our results support the hypothesis that ICMEs show different signatures depending on the in situ spacecraft trajectory, in terms of apex versus flank hits.

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