Figure 12. Comparison of ASIM and ISS LIS observations of a lightning flash over Madagascar. (top) an image of the lightning flash captured by the ASIM camera with ISS LIS events from the group closest in time to the frame (i.e., black line in bottom panel) plotted as green symbols whose size correspond to the radiance measured by the LIS camera and scaled (10-4) to match the same units of ASIM radiance, which are given in logarithmic scale to enhance the illuminated pixels. (bottom) time-series of ASIM 777.4 nm photometer (red) and LIS groups (green) with the shaded region corresponding to the duration of the ASIM camera frame.