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Fig. 5


Stills from the two movies illustrating the temporal and spatial evolution of a C2.0 class flare observed on 2007 August 24 in active region NOAA 10969 with the Swedish Solar Telescope. The data have been obtained with a wide band filter centered in Hα (FWHM 8 Å) and a filter centered in the Ca ii K core (FWHM 1.5 Å). This flare has shown a white-light continuum previously reported by Jess et al. (2008). The first frame in the Ca K movie was obtained at 07:50:30 UT and the corresponding frame in the Hα wideband was acquired at 07:50:40 UT. Imaging spectroscopy of the event revealed high chromospheric velocities and quasi-periodic oscillations similar to those detected in hard X-ray and radio wavelengths. The results and methodology are discussed in detail in the text. Movies are available online.

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