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MAGNETIC-RECONNECTION GENERATED SHOCK WAVES AS A DRIVER OF SOLAR SURGES
Yang, Heesu,Chae, Jongchul,Lim, Eun-Kyung,Lee, Kyoung-sun,Park, Hyungmin,Song, Dong-uk,Cho, Kyuhyoun IOP Publishing 2014 ASTROPHYSICAL JOURNAL LETTERS - Vol.790 No.1
<P>We found that a surge consists of multiple shock features. In our high-spatiotemporal spectroscopic observation of the surge, each shock is identified with the sudden appearance of an absorption feature at the blue wings of the Ca II 8542 angstrom line and Ha line that gradually shifts to the red wings. The shock features overlap with one another with the time interval of 110 s, which is much shorter than the duration of each shock feature, 300-400 s. This finding suggests that the multiple shocks might not have originated from a train of sinusoidal waves generated by oscillations and flows in the photosphere. As we found the signature of the magnetic flux cancelations at the base of the surge, we conclude that the multiple shock waves in charge of the surge were generated by the magnetic reconnection that occurred in the low atmosphere in association with the flux cancelation.</P>
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>