arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1702.06607astro-ph.SRphysics.space-ph
收藏

行星际日冕物质抛射的鞘层积累传播

Sheath-Accumulating Propagation of Interplanetary Coronal Mass Ejection

Takuya Takahashi, Kazunari Shibata

摘要:

行星际快速日冕物质抛射(行星际CME或ICME)是最强空间天气风暴(如太阳高能粒子事件和磁暴)的驱动因素。与地球上快速ICME相关的影响太阳风扰动的空间天气与在太阳附近观测到的高能CME的特征之间的联系,是研究空间天气风暴以及发展实用空间天气预测的一个关键问题。这种激波驱动的快速ICME在传播过程中通常会以超音速膨胀,导致前方激波鞘层等离子体的不断积累。在本文中,我们提出了“鞘积累传播”(SAP)模型,考虑到鞘区上游太阳风等离子体积累的过程,描述行星际鞘和减速ICME喷出物的共同演化。基于SAP模型,我们讨论了ICME的减速特征,ICME在地球上快速发生的基本条件,行星际鞘的厚度,到达时间的预测,以及与巨大太阳耀斑有关的超强磁暴。我们定量地指出,在讨论上述五点时,日冕物质抛射的速度和质量都是至关重要的。讨论了SAP模型与\citet{tappin2006}提出的基于拖曳的模型和“雪犁”模型之间的异同。

英文摘要:

Fast interplanetary coronal mass ejections (interplanetary CMEs, or ICMEs) are the drivers of strongest space weather storms such as solar energetic particle events and geomagnetic storms. The connection between space weather impacting solar wind disturbances associated with fast ICMEs at Earth and the characteristics of causative energetic CMEs observed near the Sun is a key question in the study of space weather storms as well as in the development of practical space weather prediction. Such shock-driving fast ICMEs usually expand at supersonic speed during the propagation, resulting in the continuous accumulation of shocked sheath plasma ahead. In this paper, we propose the "sheath-accumulating propagation" (SAP) model that describe the coevolution of the interplanetary sheath and decelerating ICME ejecta by taking into account the process of upstream solar wind plasma accumulation within the sheath region. Based on the SAP model, we discussed (1) ICME deceleration characteristics, (2) the fundamental condition for fast ICME at Earth, (3) thickness of interplanetary sheath, (4) arrival time prediction and (5) the super-intense geomagnetic storms associated with huge solar flares. We quantitatively show that not only speed but also mass of the CME are crucial in discussing the above five points. The similarities and differences among the SAP model, the drag-based model and the`snow-plough' model proposed by \citet{tappin2006} are also discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑