Non-Gaussian Line Profiles in a Large Solar Flare Observed on 2006 December 13
Mariska, J. T.; Hara, H.; Watanabe, T.; Harra, L. K.; Minoshima, T.; Imada, S.; Asai, A.
Japan, United Kingdom, United States
Abstract
We have studied the characteristics of the non-Gaussian line profile of the Fe XIV 274.20 Å 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.