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Magnetic Flux Emergence in a Coronal Hole
Solar Physics ( IF 2.8 ) Pub Date : 2020-05-01 , DOI: 10.1007/s11207-020-01629-9
Judith Palacios , Dominik Utz , Stefan Hofmeister , Kilian Krikova , Peter Gömöry , Christoph Kuckein , Carsten Denker , Meetu Verma , Sergio Javier González Manrique , Jose Iván Campos Rozo , Július Koza , Manuela Temmer , Astrid Veronig , Andrea Diercke , Ioannis Kontogiannis , Consuelo Cid

A joint campaign of various space-borne and ground-based observatories, comprising the Japanese Hinode mission (Hinode Observing Plan 338, 20 – 30 September 2017), the GREGOR solar telescope, and the Vacuum Tower Telescope (VTT), investigated numerous targets such as pores, sunspots, and coronal holes. In this study, we focus on the coronal hole region target. On 24 September 2017, a very extended non-polar coronal hole developed patches of flux emergence, which contributed to the decrease of the overall area of the coronal hole. These flux emergence patches erode the coronal hole and transform the area into a more quiet-Sun-like area, whereby bipolar magnetic structures play an important role. Conversely, flux cancellation leads to the reduction of opposite-polarity magnetic fields and to an increase in the area of the coronal hole. Other global coronal hole characteristics, including the evolution of the associated magnetic flux and the aforementioned area evolution in the EUV, are studied using data of the Helioseismic and Magnetic Imager (HMI) and Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO). The interplanetary medium parameters of the solar wind display values compatible with the presence of the coronal hole. Furthermore, a particular transient is found in those parameters.

中文翻译:

日冕孔中的磁通量出现

由日本 Hinode 任务(Hinode Observing Plan 338,2017 年 9 月 20 日至 30 日)、GREGOR 太阳望远镜和真空塔望远镜 (VTT) 组成的各种星载和地面天文台联合行动,调查了许多目标,例如如毛孔、太阳黑子和日冕洞。在这项研究中,我们专注于冠状孔区域目标。2017 年 9 月 24 日,一个非常扩展的非极日冕洞出现了通量出现的斑块,导致日冕洞的整体面积减少。这些磁通量出现斑块侵蚀了日冕洞,并将该区域变成了一个更安静的类似太阳的区域,其中双极磁结构发挥了重要作用。相反,磁通抵消导致相反极性磁场的减少和冠状孔面积的增加。使用太阳动力学天文台 (SDO) 上的日震和磁成像仪 (HMI) 和大气成像组件 (AIA) 的数据研究了其他全球日冕洞特征,包括相关磁通量的演变和上述 EUV 区域的演变)。太阳风的行星际介质参数显示值与日冕洞的存在兼容。此外,在这些参数中发现了特定的瞬态。太阳风的行星际介质参数显示值与日冕洞的存在兼容。此外,在这些参数中发现了特定的瞬态。太阳风的行星际介质参数显示值与日冕洞的存在兼容。此外,在这些参数中发现了特定的瞬态。
更新日期:2020-05-01
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