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arXiv 1603.04555astro-ph.SRphysics.space-ph
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2015年最强耀斑-CME事件:太阳和地球轨道之间的传播和相互作用效应

Intense Flare-CME Event of the Year 2015: Propagation and Interaction Effects between Sun and Earth's Orbit

Abhishek Johri, P. K. Manoharan

摘要:

在本文中,我们报告了2015年5月5日发生的与强烈X2.7耀斑相关的快速日冕物质抛射(CME)的行星际效应。利用171 μ m的极紫外图像和米波观测资料,得到了低冕高$<$ 2 {R $_{\odot}$ }处CME的近日特征。近太阳和行星际介质中CME驱动的射电爆发的强度和持续时间表明,这次CME事件是一次高能事件。行星际闪烁数据以及低频无线电频谱在理解日冕物质抛射在日光层内部的速度和膨胀的径向演变以及它与先前缓慢日冕物质抛射的相互作用方面发挥了至关重要的作用。对CME沿太阳几个点的速度估计为1天文单位表明:i)CME经历了快速加速和膨胀,达到$\approx$ 6 {R $_{\odot}$ }的高度,ii)CME继续以$\geq$ 800 km $^{-1}$的速度在太阳和1天文单位之间传播。这些结果表明,CME很可能在其内部磁能的支持下克服了环境/背景太阳风施加的阻力。当CME与一个缓慢的前CME相互作用时,与CME驱动的扰动相关的湍流水平显著增加。

英文摘要:

In this paper, We report the interplanetary effects of a fast coronal mass ejection (CME) associated with the intense X2.7 flare that occurred on 05 May 2015. The near-Sun signatures of the CME at low-coronal heights $<$2 {R$_{\odot}$} are obtained from the EUV images at 171 Å and metric radio observations. The intensity and duration of the CME-driven radio bursts in the near-Sun and interplanetary medium indicate this CME event to be an energetic one. The interplanetary scintillation data, along with the low-frequency radio spectrum, played a crucial role in understanding the radial evolution of the speed and expansion of the CME in the inner heliosphere as well as its interaction with a preceding slow CME. The estimation of the speed of the CME at several points along the Sun to 1 AU shows shows that i) the CME went through a rapid acceleration as well as expansion up to a height of $\approx$6 {R$_{\odot}$}, and ii) the CME continued to propagate at speed $\geq$800 kms$^{-1}$ between the Sun and 1 AU. These results show that the CME likely overcame the drag exerted by the ambient/background solar-wind with the support of its internal magnetic energy. When the CME interacted with a slow preceding CME, the turbulence level associated with the CME-driven disturbance increased significantly.

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。

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