CME星团和CME-CME相互作用在产生持续\(\gamma \)射线发射事件中的作用

IF 2.4 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Atul Mohan, Pertti Mäkelä, Natchimuthuk Gopalswamy, Sachicko Akiyama, Seiji Yashiro
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引用次数: 0

摘要

快速(\(\mathrm{V}_{\mathrm{CME}} > 1000\text{ km}\,\text{s}^{-1}\))日冕物质抛射(cme)能够加速质子超过300兆电子伏,被认为在脉冲耀斑阶段后触发长达数小时的持续\(\gamma \)射线发射(SGRE)。与此同时,CME-CME相互作用会导致质子加速增强,增加太阳高能粒子的通量。本研究探讨了CME星团期间快速CME相互作用在SGRE产生中的作用,我们将CME星团定义为与来自同一活动区域(AR)的等待时间为1天的c级耀斑相关的一系列CME。我们将重点放在主要CME产生区(major ARs)中的星团上,将主要AR定义为产生与主要(&gt; m级)耀斑相关的CME的星团。该研究确定了2011年至2019年期间的76次主要ar,其中12次产生了所有SGRE事件。与没有sgre的ar相比,产生sgre的ar在其最快日冕物质抛射速度(2013年vs. 775 km s−1)和最强耀斑级别(X1.8 vs. M5.8)上表现出更高的中值。它们也产生了相对更快的日冕物质抛射(中位数速度:1418 vs 1206.5 km s - 1),与sgre相关的日冕物质抛射发生在比典型的快速日冕物质抛射时期更高的时期。22个中的12个(54.5)%) SGRE events and 5 of 7 (71.4%) long-duration (> 10 h) SGRE events occurred during CME clusters, with high chances of CME-CME interactions. A case study on very active major ARs showed that all SGRE-associated CMEs with \(\mathrm{V}_{\mathrm{CME}} \lesssim 2000\text{ km}\,\text{s}^{-1}\) underwent CME-CME interactions within ≲ 10 \({\mathrm{R_{\odot }}}\), while SGRE-associated CMEs faster than 3000 km s−1 did not undergo interactions.
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Role of CME Clusters and CME-CME Interactions in Producing Sustained \(\gamma \)-Ray Emission Events

Fast (\(\mathrm{V}_{\mathrm{CME}} > 1000\text{ km}\,\text{s}^{-1}\)) coronal mass ejections (CMEs) capable of accelerating protons beyond 300 MeV are thought to trigger hours-long sustained \(\gamma \)-ray emission (SGRE) after the impulsive flare phase. Meanwhile, CME-CME interactions can cause enhanced proton acceleration, increasing the fluxes of solar energetic particles. This study explores the role of fast CME interactions in SGRE production during CME clusters, which we define as a series of CMEs linked to > C-class flares with waiting times < 1 day from the same active region (AR). We focus on clusters in major CME-productive ARs (major ARs), by defining a major AR as one that produced > 1 CME associated to a major (> M-class) flare. The study identified 76 major ARs between 2011 and 2019, of which 12 produced all SGRE events. SGRE-producing ARs exhibit higher median values for the speed of their fastest CMEs (2013 vs. 775 km s−1) and the class of their strongest flares (X1.8 vs. M5.8), compared to SGRE-lacking ARs. They also produced relatively faster CMEs (median speed: 1418 vs. 1206.5 km s−1), with the SGRE-associated CMEs occurring during periods of higher CME rates than typical fast CME epochs. Twelve of 22 (54.5%) SGRE events and 5 of 7 (71.4%) long-duration (> 10 h) SGRE events occurred during CME clusters, with high chances of CME-CME interactions. A case study on very active major ARs showed that all SGRE-associated CMEs with \(\mathrm{V}_{\mathrm{CME}} \lesssim 2000\text{ km}\,\text{s}^{-1}\) underwent CME-CME interactions within ≲ 10 \({\mathrm{R_{\odot }}}\), while SGRE-associated CMEs faster than 3000 km s−1 did not undergo interactions.

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来源期刊
Solar Physics
Solar Physics 地学天文-天文与天体物理
CiteScore
5.10
自引率
17.90%
发文量
146
审稿时长
1 months
期刊介绍: Solar Physics was founded in 1967 and is the principal journal for the publication of the results of fundamental research on the Sun. The journal treats all aspects of solar physics, ranging from the internal structure of the Sun and its evolution to the outer corona and solar wind in interplanetary space. Papers on solar-terrestrial physics and on stellar research are also published when their results have a direct bearing on our understanding of the Sun.
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