Abstract We investigate quasi-periodic coronal pulsations during the decay phase of an X 3.2 class flare on 14 May 2013, using soft X-ray data from the RHESSI satellite. Periodogram analyses of soft X-ray light curves show that 53s and 72s periods co-exist in the 3–6keV, 6–12keV and 12–25keV energy bands. Considering the typical length of the flaring loop system and observed periodicities, we find that they are associated with multiple (first two harmonics) of fast magnetoacoustic sausage waves. The phase relationship of soft X-ray emissions in different energy bands using cross-correlation technique show that these modes are standing in nature as we do not find the phase lag. Considering the period ratio, we diagnose the local plasma conditions of the flaring region by invoking MHD seismology. The period ratio P 1/2P 2 is found to be 0.65, which indicates that such oscillations are most likely excited in longitudinal density stratified loops.


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    Title :

    Study of multi-periodic coronal pulsations during an X-class solar flare


    Contributors:

    Published in:

    Advances in Space Research ; 56 , 12 ; 2769-2778


    Publication date :

    2015-08-07


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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