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arXiv 2409.03582astro-ph.SR
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探索较热太阳大气的动态旋转轮廓:基于SDO/AIA数据的多波长方法

Exploring the dynamic rotational profile of the hotter solar atmosphere: A multi-wavelength approach using SDO/AIA data

Srinjana Routh, Bibhuti Kumar Jha, Dibya Kirti Mishra, Tom Van Doorsselaere, Vaibhav Pant, Subhamoy Chatterjee, Dipankar Banerjee

AI总结:

本文利用SDO/AIA多波长数据研究太阳大气旋转轮廓,发现大气层赤道旋转更快且较差性更弱,并与内部旋转及太阳活动周存在关联。

摘要:

理解太阳大气的全球旋转轮廓及其变化,对于全面认识太阳磁场动力学以及太阳不同层之间耦合程度至关重要。在本研究中,我们采用图像相关方法,分析太阳动力学观测台的大气成像组件在不同波长通道中提供的广泛数据集。我们发现,在代表太阳大气的所有温度下,赤道旋转速率($A$)显著增加,绝对纬度梯度($|B|$)减小,这意味着与分别从多普勒测量和太阳黑子推导出的底层光球旋转速率相比,赤道旋转速度最多快$4.18\\%$和$1.92\\%$,且较差性更弱。此外,我们还发现太阳大气不同层的赤道旋转速率($A$)显著增加,较差性减弱($|B|$减小)。我们还探索了从太阳内部到大气的可能联系,并有趣地发现,在$r=0.94\\,\mathrm{R}_{\odot}$和$0.965\\,\mathrm{R}_{\odot}$处的$A$分别与171埃、304埃和1600埃表现出极好的匹配。此外,我们观察到从1600埃、131埃、193埃和211埃测得的旋转参数与年平均太阳黑子数之间存在正相关,这表明太阳自转可能依赖于与太阳活动周相关的磁结构的出现,或者太阳大气中的太阳自转存在活动周依赖性。

英文摘要:

Understanding the global rotational profile of the solar atmosphere and its variation is fundamental to uncovering a comprehensive understanding of the dynamics of the solar magnetic field and the extent of coupling between different layers of the Sun. In this study, we employ the method of image correlation to analyze the extensive dataset provided by the Atmospheric Imaging Assembly of the Solar Dynamic Observatory in different wavelength channels. We find a significant increase in the equatorial rotational rate ($A$) and a decrease in absolute latitudinal gradient ($|B|$) at all temperatures representative of the solar atmosphere, implying an equatorial rotation up to $4.18\%$ and $1.92\%$ faster and less differential when compared to the rotation rates for the underlying photosphere derived from Doppler measurement and sunspots respectively. In addition, we also find a significant increase in equatorial rotation rate ($A$) and a decrease in differential nature ($|B|$ decreases) at different layers of the solar atmosphere. We also explore a possible connection from the solar interior to the atmosphere and interestingly found that $A$ at $r=0.94\,\mathrm{R}_{\odot}, 0.965\,\mathrm{R}_{\odot}$ show an excellent match with 171 Angstrom, 304 Angstrom and 1600 Angstrom, respectively. Furthermore, we observe a positive correlation between the rotational parameters measured from 1600 Angstrom, 131 Angstrom, 193 Angstrom and 211 Angstrom with the yearly averaged sunspot number, suggesting a potential dependence of the solar rotation on the appearance of magnetic structures related to the solar cycle or the presence of cycle dependence of solar rotation in the solar atmosphere.

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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