Fig. 2
From: Imaging spectroscopy of solar radio burst fine structures
Radio images of the fine structure components of the burst. Superimposed images of the Extreme Ultra-Violet (EUV) and radio emission at the selected 32.5 MHz frequency (Fig. 1). Green: Observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly43 171 Å at 2015 April 16 11:57 UT; Red: radio fundamental plasma frequency (F) component at 11:56:57.5 UT; Blue: second-harmonic (H) radio component at 11:57:01 UT. The centroid positions of the F- and H-components are marked with white and black crosses, respectively. The full width at half-maximum (FWHM) ellipses are made using two-dimensional Gaussian fits to the data. The white dots show the phased array beam locations and the oval shows the half-maximum synthesized LOw Frequency ARray (LOFAR) beam. See also Supplementary Movie 1
