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We explore the temporal relationship between microwave/HXR emission andDoppler velocity during the impulsive phase of a solar flare on 2014 October 27(SOL2014-10-27), which displays a pulse on the light curves in microwave (34GHz) and hard X-ray (HXR, 25-50 keV) bands before the flare maximum. Imagingobservation shows that this pulse mainly comes from one footpoint of a solarflare loop. The slit of Interface Region Imaging Spectrograph (IRIS) stays atthis footpoint during this solar flare. The Doppler velocities of Fe XXI1354.09 A and Si IV 1402.77 A are extracted from the Gaussian fitting method.We find that the hot line of Fe XXI 1354.09 A (logT~7.05) in corona exhibitsblue shift, while the cool line of Si IV 1402.77 A (logT~4.8) in transitionregion exhibits red shift, indicating explosive chromospheric evaporation. Theevaporative upflows along the flare loop are also observed in the AIA 131 Aimage. To our knowledge, this is the first report of chromospheric evaporationevidence from both spectral and imaging observations in the same flare. Bothmicrowave and HXR pulses are well correlated with the Doppler velocities,suggesting that the chromospheric evaporation is driven by nonthermal electronsaround this footpoint of a solar flare loop.

Explosive chromospheric evaporation driven by nonthermal electrons around one footpoint of a solar flare loop