  Temporary enhancements of the coronal emission measure in a quiet region have
been shown to constitute a significant energy input. Here some relatively large
events are studied for simultaneous brightenings in transition region lines and
in radio emission. Associated emissions are discussed and tested for
characteristics known from full-sized impulsive flares in active regions.
Heating events and flares are found to have many properties in common,
including (i) associated polarized radio emission, which usually precedes the
emission measure peak (Neupert effect) and sometimes has a non-thermal
spectrum, and (ii) associated and often preceding peaks in O V and He I
emission. On the other hand, heating events also differ from impulsive flares:
(i) In half of the cases, their radio emission at centimeter waves shows a
spectrum consistent with thermal radiation,(ii) the ratio of the
gyro-synchrotron emission to the estimated thermal soft X-ray emission is
smaller than in flares, and (iii) the associated emission in the O V transition
region line shows red shifts and blue shifts, indicating upflows in the rise
phase and downflows in the decay phase, respectively. Nevertheless, the
differences seem to be mainly quantitative, and the analyzed heating events
with thermal energies around 10^26 erg may in principle be considered as
microflares or large nanoflares, thus small versions of regular flares.
