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We present observations of a B7.9-class flare that occurred on the 24thJanuary, 2015, using the Atmopsheric Imaging Assembly (AIA) of the SolarDynamics Observatory (SDO), the EUV Imaging Spectrometer (EIS) and the X-RayTelescope of Hinode. The flare triggers the eruption of a dense cool plasmablob as seen in AIA 171\AA,\, which is unable to completely break out andremains confined within a local bundle of active region loops. During thisprocess, transverse oscillations of the threads are observed. The cool plasmais then observed to descend back to the chromosphere along each loop strand. Atthe same time, a larger diffuse co-spatial loop observed in the hot wavebandsof SDO/AIA and Hinode/XRT is formed, exhibiting periodic intensity variationsalong its length. The formation and evolution of magnetohydrodynamic (MHD)waves depend upon the values of the local plasma parameters (e.g. density,temperature and magnetic field), which can hence be inferred by coronalseismology. In this study we aim to assess how the observed MHD modes areaffected by the variation of density and temperature. We combined analysis ofEUV/X-ray imaging and spectroscopy using SDO/AIA, Hinode/EIS and XRT. We showthat the evolution of the detected waves is determined by the temporalvariations of the local plasma parameters, caused by the flare heating and theconsequent cooling. We apply coronal seismology to both waves obtainingestimations of the background plasma parameters.

Multi-instrument observations of a failed flare eruption associated with MHD waves in a loop bundle