Fig. 1.

For flare SOL2003-10-28T11:10: the flux density spectrum F(ν) showing the rising sub-THz component above 200 GHz (left panel), after Trottet et al. (2008) and UV solar flare ribbon observed by TRACE in the 1600 Å passband at 11:16:20 UT; 10 000 DN s−1 and 12 000 DN s−1 levels are shown as red and black contours (right panel).
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