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Quasi-periodic pulsations (QPP) seen in the time derivative of the GOES softX-ray light curves are analyzed for the near-limb X3.2 event on 14 May 2013.The pulsations are apparent for a total of at least two hours from theimpulsive phase to well into the decay phase, with a total of 163 distinctpulses evident to the naked eye. A wavelet analysis shows that thecharacteristic time scale of these pulsations increases systematically from$\sim$25 s at 01:10 UT, the time of the GOES peak, to $\sim$100 s at 02:00 UT.A second ridge in the wavelet power spectrum, most likely associated withflaring emission from a different active region, shows an increase from$\sim$40 s at 01:40 UT to $\sim$100 s at 03:10 UT. We assume that the QPP thatproduced the first ridge result from vertical kink-mode oscillations of thenewly formed loops following magnetic reconnection in the coronal currentsheet. This allows us to estimate the magnetic field strength as a function ofaltitude given the density, loop length, and QPP time scale as functions oftime determined from the GOES light curves and RHESSI images. The calculatedmagnetic field strength of the newly formed loops ranges from about $\sim$500 Gat an altitude of 24 Mm to a low value of $\sim$10 G at 60 Mm, in generalagreement with the expected values at these altitudes. Fast sausage modeoscillations are also discussed and cannot be ruled out as an alternatemechanism for producing the QPP.

Detection and Interpretation Of Long-Lived X-Ray Quasi-Periodic Pulsations in the X-Class Solar Flare On 2013 May 14