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arXiv 1802.05657astro-ph.SR
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IRIS观测太阳大气中预先存在的和新出现的磁场之间的磁相互作用。I.全面进化

IRIS observations of magnetic interactions in the solar atmosphere between pre-existing and emerging magnetic fields. I. Overall evolution

Salvo L. Guglielmino, Francesca Zuccarello, Peter R. Young, Mariariata Murabito, Paolo Romano

摘要:

我们报告的多波长紫外线观测与IRIS卫星,有关的出现阶段在上层色球层和过渡区的新兴通量区(EFR)嵌入在活动区NOAA 12529的预先存在的领域。IRIS数据得到太阳动力学观测卫星与光球和日冕有关的全磁盘观测的补充。EFR的光球配置也进行了分析的测量与日之出卫星上的分光偏振计,当EFR完全开发。在EFR的边缘,发现了类似于紫外线爆发的经常性强烈增亮,在所有日冕通带中都有对应物。在色球层和日冕层,在观测到的增亮附近也观测到喷流活动。对IRIS谱线剖面的分析揭示了太阳低层大气中稠密等离子体的加热以及在相同位置上速度高达100 km/s的双向高速流的驱动。与以前的观测和数值模型相比,这些签名表明,新兴的双极和环境场之间的几个长期的,小规模的磁重联事件的证据。这一过程导致先前存在的光球通量浓度被取消,并且似乎在大气中比通常在紫外线爆发中发现的更高,解释了观测到的日冕对应物。

英文摘要:

We report multi-wavelength ultraviolet observations taken with the IRIS satellite, concerning the emergence phase in the upper chromosphere and transition region of an emerging flux region (EFR) embedded in the pre-existing field of active region NOAA 12529. IRIS data are complemented by full-disk observations of the Solar Dynamics Observatory satellite, relevant to the photosphere and the corona. The photospheric configuration of the EFR is also analyzed by measurements taken with the spectropolarimeter aboard the Hinode satellite, when the EFR was fully developed. Recurrent intense brightenings that resemble UV bursts, with counterparts in all coronal passbands, are identified at the edges of the EFR. Jet activity is also observed at chromospheric and coronal levels, near the observed brightenings. The analysis of the IRIS line profiles reveals the heating of dense plasma in the low solar atmosphere and the driving of bi-directional high-velocity flows with speed up to 100 km/s at the same locations. Compared with previous observations and numerical models, these signatures suggest evidence of several long-lasting, small-scale magnetic reconnection episodes between the emerging bipole and the ambient field. This process leads to the cancellation of a pre-existing photospheric flux concentration and appears to occur higher in the atmosphere than usually found in UV bursts, explaining the observed coronal counterparts.

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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