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arXiv 2005.12839astro-ph.SR
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论跨平等循环的形成与动态

Formation and Dynamics of Transequatorial Loops

Avyarthana Ghosh, Durgesh Tripathi

摘要:

利用成像和光谱学研究跨赤道环的动力学演变。我们使用了太阳动力学观测站上的大气成像装置和日震磁成像仪记录的图像以及Hinode上的极紫外成像光谱仪进行的光谱观测。来自AIA 193通道的数据显示,TEL形成于AR 12230和新出现的AR 12234之间,并在2014年12月10日至14日期间演化。2014年12月12日的xt图使用AIA 193 ESTA数据获得,揭示了流入和流出X区域的特征。高节奏AIA图像还显示了在X区域(P2)附近的经常性强度增强,观察到在log T[K] =6.20处形成的谱线具有较高的强度,并且在其他较高温度处具有空隙。X区和P2区的电子密度和温度分别稳定地保持在logN_e =8.5-8.7 /cc和logT [K] =6.20。在X区域的多普勒速度显示,当靠近盘中心时,红移约为5-8 km/s,但当远离中心时,蓝移(以及一些零速度像素)。FWHM图显示Fe XII、Fe XIII和Fe XV谱线的非热速度约为27-30 km/s。然而,最亮的像素具有Fe XII和Fe XIII线的约62 km/s的非热速度。相反,Fe XV线的暗X区具有最高的非热速度(约115 km/s)。我们的结论是,TEL的形成是由于磁重联。我们进一步注意到,TEL本身经历磁重联,导致个别AR的环路的重组。此外,这项研究,第一次,提供了测量等离子体参数的X区域,从而提供必要的约束条件的理论研究。

英文摘要:

To study the dynamical evolution of trans-equatorial loops (TELs) using imaging and spectroscopy. We have used the images recorded by the Atmospheric Imaging Assembly and the Helioseismic Magnetic Imager on-board the Solar Dynamics Observatory and spectroscopic observations taken from the Extreme-Ultraviolet Imaging Spectrometer on-board Hinode. The data from AIA 193 Å channel show that TELs are formed between AR 12230 and a newly emerging AR 12234 and evolved during December 10-14, 2014. The xt-plots for December 12, 2014 obtained using AIA 193 Å data reveal signatures of inflow and outflow towards an X-region. High cadence AIA images also show recurrent intensity enhancements in close proximity to the X-region (P2), which is observed to have higher intensities for spectral lines formed at log T[K] =6.20 and voids at other higher temperatures. The electron densities and temperatures in the X-region (and P2) are maintained steadily at log N_e =8.5-8.7 /cc and log T[K] =6.20, respectively. Doppler velocities in the X-region show predominant redshifts by about 5-8 km/s when closer to the disk centre but blueshifts (along with some zero-velocity pixels) when away from the centre. The Full-Width-Half-Maxima (FWHM) maps reveal non-thermal velocities of about 27-30 km/s for Fe XII, Fe XIII and Fe XV lines. However, the brightest pixels have non-thermal velocities of about 62 km/s for Fe XII and Fe XIII lines. On the contrary, the dark X-region for Fe XV line have the highest non-thermal velocity (roughly 115 km/s). We conclude that the TELs are formed due to magnetic reconnection. We further note that the TELs themselves undergo magnetic reconnection leading to reformation of loops of individual ARs. Moreover, this study, for the first time, provides measurements of plasma parameters in X-regions thereby providing essential constraints for theoretical studies.

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