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SUPERPENUMBRAL FIBRILS POWERED BY SUNSPOT OSCILLATIONS
Chae, Jongchul,Yang, Heesu,Park, Hyungmin,Maurya, Ram Ajor,Cho, Kyung-Suk,Yurchysyn, Vasyl IOP Publishing 2014 The Astrophysical journal Vol.789 No.2
<P>It is still a mystery how the solar chromosphere can stand high above the photosphere. The dominant portion of this layer must be dynamically supported, as is evident by the common occurrence of jets such as spicules and mottles in quiet regions, and fibrils and surges in active regions. Hence, revealing the driving mechanism of these chromospheric jets is crucial for our understanding of how the chromosphere itself exists. Here, we report our observational finding that fibrils in the superpenumbra of a sunspot are powered by sunspot oscillations. We find patterns of outward propagation that apparently originate from inside the sunspot, propagate like running penumbral waves, and develop into the fibrils. Redshift ridges seen in the time-distance plots of velocity often merge, forming a fork-like pattern. The predominant period of these shock waves increases, often jumping with distance, from 3 minutes to 10 minutes. This short-to-long period transition seems to result from the selective suppression of shocks by the falling material of their preceding shocks. Based on our results, we propose that the fibrils are driven by slow shock waves with long periods that are produced by the merging of shock waves with shorter periods propagating along the magnetic canopy.</P>
다중 스케일 특징 융합을 통한 트랜스포머 기반 장기 시계열 예측 정확도 향상 기법
민희수 ( Heesu Min ),채동규 ( Dong-kyu Chae ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.2
본 논문에서는 정확한 장기 시계열 예측을 위해 시계열 데이터의 다양한 스케일 (시간 규모)에서 표현을 학습하는 트랜스포머 모델을 제안한다. 제안하는 모델은 시계열의 다중 스케일 특징을 추출하고, 이를 트랜스포머에 반영하여 예측 시계열을 생성하는 구조로 되어 있다. 스케일 정규화 과정을 통해 시계열의 전역적 및 지역적인 시간 정보를 효율적으로 융합하여 종속성을 학습한다. 3 가지의 다변량 시계열 데이터를 이용한 실험을 통해 제안하는 방법의 우수성을 보인다.
FINE-SCALE PHOTOSPHERIC CONNECTIONS OF ELLERMAN BOMBS
Yang, Heesu,Chae, Jongchul,Lim, Eun-Kyung,Song, Donguk,Cho, Kyuhyoun,Kwak, Hannah,Yurchyshyn, Vasyl B,Kim, Yeon-Han American Astronomical Society 2016 The Astrophysical journal Vol.829 No.2
<P>We investigate the photospheric and magnetic field structures associated with Ellerman bombs (EBs) using the 1.6 m New Solar Telescope at Big Bear Solar Observatory. The nine observed EBs were accompanied by elongated granule-like features (EGFs) that showed transverse motions prior to the EBs with an average speed of about 3.8 km s(-1). Each EGF consisted of a sub-arcsecond bright core encircled by a dark lane around its moving front. The bright core appeared in the TiO broadband filter images and in the far wings of the H alpha and Ca II 8542 angstrom. lines. In four EBs, the bi-directional expanding motion of the EGFs was identified in the TiO images. In those cases, the EGFs were found to be accompanied by an emerging flux (EF). In four other EBs, the EGF developed at the edge of a penumbra and traveled in the sunspot's radial direction. The EGFs in these cases were identified as a moving magnetic feature (MMF). Our results show a clear connection among the magnetic elements, photospheric features, and EBs. This result suggests that the EBs result from magnetic reconnection forced by EFs or MMFs that are frequently manifested by EGFs.</P>