تقرير
The chromosphere underneath a Coronal Bright Point
| العنوان: | The chromosphere underneath a Coronal Bright Point |
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| المؤلفون: | Bose, Souvik, Nóbrega-Siverio, Daniel, De Pontieu, Bart, van der Voort, Luc Rouppe |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | Coronal Bright Points (CBPs) are sets of small-scale coronal loops, connecting opposite magnetic polarities, primarily characterized by their enhanced extreme-ultraviolet (EUV) and X-ray emission. Being ubiquitous, they are thought to play an important role in heating the solar corona. We aim at characterizing the barely-explored chromosphere underneath CBPs, focusing on the related spicular activity and on the effects of small-scale magnetic flux emergence on CBPs. We used high-resolution observations of a CBP in H$\beta$ and Fe I 617.3 nm from the Swedish 1-m Solar Telescope (SST) in coordination with the Solar Dynamics Observatory (SDO). This work presents the first high-resolution observation of spicules imaged in H$\beta$. The spicules were automatically detected using advanced image processing techniques, which were applied to the Dopplergrams derived from H$\beta$. Here we report their abundant occurrence close to the CBP ``footpoints", and find that the orientation of such spicules is aligned along the EUV loops, indicating that they constitute a fundamental part of the whole CBP magnetic structure. Spatio-temporal analysis across multiple channels indicates that there are coronal propagating disturbances associated with the studied spicules, producing transient EUV intensity variations of the individual CBP loops. Two small-scale flux emergence episodes appearing below the CBP were analyzed; one of them leading to quiet-sun Ellerman bombs and enhancing the nearby spicular activity. This paper presents unique evidence of the tight coupling between the lower and upper atmosphere of a CBP, thus helping to unravel the dynamic phenomena underneath CBPs and their impact on the latter. Comment: Accepted for publication in the Astrophysical Journal. 16 pages, 11 figures. Animations embedded |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/acb544 |
| URL الوصول: | http://arxiv.org/abs/2301.08596 |
| رقم الأكسشن: | edsarx.2301.08596 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/acb544 |
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