000002914 001__ 2914
000002914 005__ 20160825080439.0
000002914 0247_ $$2DOI$$a10.3847/2041-8205/827/2/L30
000002914 037__ $$aSCART-2016-0014
000002914 100__ $$aHayes, Laura A.
000002914 245__ $$aQuasi-periodic Pulsations during the Impulsive and Decay phases of an X-class Flare
000002914 260__ $$c2016
000002914 520__ $$aQuasi-periodic pulsations (QPPs) are often observed in X-ray emission from solar flares. To date, it is unclear what their physical origins are. Here, we present a multi-instrument investigation of the nature of QPP during the impulsive and decay phases of the X1.0 flare of 2013 October 28. We focus on the character of the fine structure pulsations evident in the soft X-ray (SXR) time derivatives and compare this variability with structure across multiple wavelengths including hard X-ray and microwave emission. We find that during the impulsive phase of the flare, high correlations between pulsations in the thermal and non-thermal emissions are seen. A characteristic timescale of ∼20 s is observed in all channels and a second timescale of ∼55 s is observed in the non-thermal emissions. SXR pulsations are seen to persist into the decay phase of this flare, up to 20 minutes after the non-thermal emission has ceased. We find that these decay phase thermal pulsations have very small amplitude and show an increase in characteristic timescale from ∼40 s up to ∼70 s. We interpret the bursty nature of the co-existing multi-wavelength QPPs during the impulsive phase in terms of episodic particle acceleration and plasma heating. The persistent thermal decay phase QPPs are most likely connected with compressive magnetohydrodynamic processes in the post-flare loops such as the fast sausage mode or the vertical kink mode.
000002914 536__ $$aPROBA2 Guest Investigator Program; PRODEX/$$cSDE; STCE/$$fSDE; STCE
000002914 594__ $$aSTCE
000002914 700__ $$aGallagher, Peter T.
000002914 700__ $$aDennis, B. R.
000002914 700__ $$aIreland, Jack
000002914 700__ $$aInglis, Andrew R.
000002914 700__ $$aRyan, Daniel F.
000002914 773__ $$nL30$$pThe Astrophysical Journal Letters$$v827$$y2016
000002914 8560_ $$fmarie.dominique@observatoire.be
000002914 85642 $$ahttp://adsabs.harvard.edu/abs/2016ApJ...827L..30H
000002914 905__ $$apublished in
000002914 980__ $$aREFERD