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Non-Gaussian line profiles in a large solar flare observed on 2006 December 13

Imada, S; Hara, H; Watanabe, T; Asai, A; Minoshima, T; Harra, LK; Mariska, JT; (2008) Non-Gaussian line profiles in a large solar flare observed on 2006 December 13. ASTROPHYS J LETT , 679 (2) L155 - L159.

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Abstract

We have studied the characteristics of the non-Gaussian line profile of the Fe XIV 274.20 angstrom line in and around a flare arcade. We found that broad non-Gaussian line profiles associated with redshifts are observed in the flare arcade. There were two typical types of broad line profiles. One was a distorted line profile caused by multiple flows, and the other was a symmetric line profile without any additional component. We successfully distinguished those two types using higher order statistical moments or M-the additional component contribution-defined in this Letter. The distorted/symmetric broad line profiles were preferentially observed in new/old flare loops, respectively.

Type:Article
Title:Non-Gaussian line profiles in a large solar flare observed on 2006 December 13
Keywords:Sun : corona, Sun : flares, HIGH TIME RESOLUTION, CHROMOSPHERIC EVAPORATION, IMAGING SPECTROMETER, EXTREME-ULTRAVIOLET, HINODE, YOHKOH, TELESCOPE, DYNAMICS, EVENT, PHASE
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics

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