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<p>Understanding and predicting the trigger of solar flares has been an area of focus for many years. In this work, we analyze EUV coronal data from SDO/AIA and Solar Orbiter EUI EUV High Resolution Imager (HRI<sub>EUV</sub>) to determine whether regions with high free magnetic energy in the photosphere show related dynamics in the corona. We studied two large solar flares from the same active region on 19 and 20 March 2024. We found that the two identified magnetic regions with high free energy also had frequent small spatial scale EUV intensity changes as highlighted through the standard deviation of the imaging data. The standard deviation enhancement in these regions peaked at least two minutes before the GOES X-ray emission and was close in time to the peak of the non-thermal emission, providing an additional method to identify the early flare trigger location and start.</p>

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The Behaviour of the EUV Corona Before Flares in Regions with High Free Magnetic Energy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月17日

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  • Louise Harra,
  • Kanya Kusano,
  • Yingjie Zhu,
  • Krzysztof Barczynski,
  • Adriana De-Sassi,
  • Muriel Z. Stiefel,
  • Ioannis Kontogiannis,
  • Matthew J. West,
  • David H. Brooks

摘要

Understanding and predicting the trigger of solar flares has been an area of focus for many years. In this work, we analyze EUV coronal data from SDO/AIA and Solar Orbiter EUI EUV High Resolution Imager (HRIEUV) to determine whether regions with high free magnetic energy in the photosphere show related dynamics in the corona. We studied two large solar flares from the same active region on 19 and 20 March 2024. We found that the two identified magnetic regions with high free energy also had frequent small spatial scale EUV intensity changes as highlighted through the standard deviation of the imaging data. The standard deviation enhancement in these regions peaked at least two minutes before the GOES X-ray emission and was close in time to the peak of the non-thermal emission, providing an additional method to identify the early flare trigger location and start.