Heesu Yang, Jongchul Chae, Eun Kyung Lim, Donguk Song, Kyuhyoun Cho, Hannah Kwak, Vasyl Yurchyshyn, Yeon Han Kim

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


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 Hα and Ca ii 8542 Å 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.

Original languageEnglish (US)
Article number100
JournalAstrophysical Journal
Issue number2
StatePublished - Oct 1 2016

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Sun: chromosphere
  • Sun: flares
  • Sun: magnetic fields
  • Sun: photosphere Supporting material: animations
  • line: profiles


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