Spacecraft X-ray and radio observations from 2020 December 14. Top: C4.0 class X-ray flare detected by GOES-16 in both short (red; 0.05–0.4 nm) and long (blue; 0.1–0.8 nm) wavelength ranges. Middle: S/WAVES radio observations, showing two type III radio bursts. The stronger burst at about 14:37 UT corresponds to the CME and X-ray flare. Bottom: Wind/WAVES radio observations from the Earth perspective at L1.