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Astrophysics Research Centre

School of Mathematics and Physics

High Temperature Upflows in the Pre-Impulsive Phase of the 2014 October 27 X2 Flare

  • Submitted by: Michael Kennedy, Queen's University Belfast
  • Authors: M. Kennedy
  • Session: Tuesday afternoon posters.

The majority of solar flares exhibit increased soft X-ray emission several minutes before any detectable increase in hard X-ray emission which traditionally delineates the beginning of the impulsive phase. This is referred to as the pre-impulsive phase. In this study we present evidence of high velocity upflows at the footpoint of a coronal loop during the pre-impulsive phase of a X2.0 solar flare. Emission lines of Fe XXIII and Fe XXIV observed by Hinode/EIS exhibited blue shifts at a loop footpoint of up to approximately 150 km/s, while plasma at the loop apex was stationary, and redshifted along the other leg of the loop. The upflows appeared 5 minutes before a detectable increase in hard X-rays. This indicated that energy deposition and heating was occuring at one footpoint only; and that material expanded to fill the coronal loop due to pressure imbalance. A preliminary analysis is outlined for this single event and a search of the EIS flare catalogue is underway to determine if such high temperature up-flows occur in the pre-impulsive phase of other flares.

public/hinode9/schedule/session-04p/v0060.txt · Last modified: 2015/07/30 01:08 (external edit)

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