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Extreme-ultraviolet late phase (ELP) refers to the second extreme-ultraviolet(EUV) radiation enhancement observed in certain solar flares, which usuallyoccurs tens of minutes to several hours after the peak of soft X-ray emission.The coronal loop system that hosts the ELP emission is often different from themain flaring arcade, and the enhanced EUV emission therein may imply anadditional heating process. However, the origin of the ELP remains ratherunclear. Here we present the analysis of a C1.4 flare that features such anELP, which is also observed in microwave wavelengths by the Expanded OwensValley Solar Array (EOVSA). Similar to the case of the ELP, we find a gradualmicrowave enhancement that occurs about three minutes after the main impulsivephase microwave peaks. Radio sources coincide with both footpoints of the ELPloops and spectral fits on the time-varying microwave spectra demonstrate aclear deviation of the electron distribution from the Maxwellian case, whichcould result from injected nonthermal electrons or nonuniform heating to thefootpoint plasma. We further point out that the delayed microwave enhancementsuggests the presence of an additional heating process, which could beresponsible for the evaporation of heated plasma that fills the ELP loops,producing the prolonged ELP emission.

Implications for additional plasma heating driving the extreme-ultraviolet late phase of a solar flare with microwave imaging spectroscopy