Solar Physics

, 293:167 | Cite as

Energy Build-up and Triggering Leading to a M1.5 Flare on 1 August 2014

  • S. LiuEmail author
  • J. T. Su


The energy storage and trigger mechanisms of solar flares are important for understanding solar activity. We analyzed multi-wavelength observations of a M1.5 flare on 1 August 2014, in active region NOAA 12127 (SOL2014-08-01T18:13). There are evident large-scale sunspot rotations in positive magnetic field of the main energy-release region before the eruption; the rotations contain both clockwise and counter-clockwise directions. Injection of magnetic helicity from the photosphere is prior to the flare. The sign of the helicity injection is reversed after the flare. It is found that both persistent larger-scale (\({\approx}\,\mbox{one day}\)) and impulse smaller-scale (\({\approx}\,\mbox{one to two hours}\)) magnetic-flux emergences are associated with the flare. We conclude that larger-scale flux emergence, helicity injection, and sunspot rotation contribute to the energy build up, while the small-scale magnetic-flux emergence plays a crucial role in triggering the flare.


Magnetic field Solar flare Trigger Magnetic emergence 



We thank the reviewer for valuable suggestions and constructive criticism, which improved the clarity of the article. This work was partly supported by the grants: KJCX2-EW-T07, 2014FY120300, 11203036, 11473039, U1531247, 11673033, 11773038 and 11703042. We acknowledge the Strategic Priority Research Program on Space Science, CAS, Grant No. XDA15052200 and XDA15320201, and the Key Laboratory of Solar Activity National Astronomical Observations, Chinese Academy of Sciences.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.


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© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Key Laboratory of Solar Activity, National Astronomical ObservatoryChinese Academy of SciencesBeijingChina
  2. 2.School of Astronomy and Space SciencesUniversity of Chinese Academy of SciencesBeijingChina

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