Velocities and temperatures of an ellerman bomb and its associated features

Heesu Yang, Jongchul Chae, Eun Kyung Lim, Hyungmin Park, Kyuhyoun Cho, Ram Ajor Maurya, Donguk Song, Yeon Han Kim, Philip R. Goode

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Scopus citations


We investigated the velocity and temperature characteristics of an Ellerman bomb (EB) and its associated features based on observations made with the Fast Imaging Solar Spectrograph (FISS) and a broadband TiO filter of the 1.6 meter New Solar Telescope at Big Bear Solar Observatory. In the TiO images of the photospheric level, we found a granular cell expanding in two opposite directions near the site of the EB. When one end of this granule reached the EB site, the transverse speed of the tip of the expanding granule rapidly decreased and the EB brightened. The wings of the Hα profile of the EB indicated that the EB was blueshifted up to 7 kms−1. About 260 s after the EB brightening, a surge was seen in absorption and varied from a blueshift of 20 kms−1 to a redshift of 40 kms−1 seen in the Hα and Ca II 8542 Å lines. From the Doppler absorption width of the two lines determined by applying the cloud model, we estimated the mean temperature of the surge material to be about 29000 K and the mean speed of nonthermal motion to be about 11 km s−1. We discuss the physical implications of our results in terms of magnetic reconnection and processes related to it.

Original languageEnglish (US)
Title of host publicationInitial Results from the Fast Imaging Solar Spectrograph
PublisherSpringer International Publishing
Number of pages15
ISBN (Electronic)9783319121239
ISBN (Print)9783319121222
StatePublished - Jan 1 2015

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • General Chemistry


  • Active
  • Active regions
  • Chromosphere
  • Magnetic reconnection
  • Observational signatures
  • Photosphere
  • Spectrum
  • Velocity field
  • Velocity fields
  • Visible


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