  The Neupert effect is the empirical observation that the time evolution of
non-thermal emission (e.g. hard X-rays) is frequently proportional to the time
derivative of the thermal emission flux (soft X-rays), or, vice versa, that
time integrated non-thermal flux is proportional to thermal flux. We analyzed
the GOES M2.2 event SOL2011-02-14T17:25, and found that the 212 GHz emission
plays quite well the role of the thermal component of the Neupert effect. We
show that the maximum of the hard X-ray flux for energies above 50 keV is
coincident in time with the time-derivative of the 212 GHz flux, within the
uncertainties. The microwave flux density at 15.4 GHz, produced by optically
thin gyrosynchrotron mechanism, and hard-X rays above 25 keV mark the typical
impulsive phase, and have similar time evolution. On the other hand, the 12 GHz
emission is delayed by about 25 seconds with respect of the microwave and hard
X-ray peak. We argue that this delay cannot be explained by magnetic trapping
of non-thermal electrons. With all the observational evidence, we suggest that
the 212 GHz emission is produced by thermal bremsstrahlung, initially in the
chromosphere, and shifting to optically thin emission from thehot coronal loops
at the end of the gradual phase.
