OBSERVATIONS of A SERIES of FLARES and ASSOCIATED JET-LIKE ERUPTIONS DRIVEN by the EMERGENCE of TWISTED MAGNETIC FIELDS

Eun Kyung Lim, Vasyl Yurchyshyn, Sung Hong Park, Sujin Kim, Kyung Suk Cho, Pankaj Kumar, Jongchul Chae, Heesu Yang, Kyuhyoun Cho, Donguk Song, Yeon Han Kim

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Abstract

We studied temporal changes of morphological and magnetic properties of a succession of four confined flares followed by an eruptive flare using the high-resolution New Solar Telescope (NST) operating at the Big Bear Solar Observatory (BBSO) and Helioseismic and Magnetic Imager (HMI) magnetograms and Atmospheric Image Assembly (AIA) EUV images provided by the Solar Dynamics Observatory (SDO). From the NST/Hα and the SDO/AIA 304 Å observations we found that each flare developed a jet structure that evolved in a manner similar to evolution of the blowout jet: (1) an inverted-Y-shaped jet appeared and drifted away from its initial position; (2) jets formed a curtain-like structure that consisted of many fine threads accompanied by subsequent brightenings near the footpoints of the fine threads; and finally, (3) the jet showed a twisted structure visible near the flare maximum. Analysis of the HMI data showed that both the negative magnetic flux and the magnetic helicity have been gradually increasing in the positive-polarity region, indicating the continuous injection of magnetic twist before and during the series of flares. Based on these results, we suggest that the continuous emergence of twisted magnetic flux played an important role in producing successive flares and developing a series of blowout jets.

Original languageEnglish (US)
Article number39
JournalAstrophysical Journal
Volume817
Issue number1
DOIs
StatePublished - Jan 20 2016

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: activity
  • Sun: chromosphere
  • Sun: corona
  • Sun: flares
  • Sun: magnetic fields

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