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Periodic comets of different dynamical groups with orbits at 2 - 5 AU stilloccasionally active. The observed dust activity of such objects can beconnected with processes of water ice sublimation (MBCs) or crystallization ofamorphous water ice (QHCs) as well as with external causes. No connections ofcometary flares with cyclic variations of solar activity indexes were found.But some individual solar flares can affect the brightness of comets. Cometaryobjects in the main asteroid belt have a lower statistic of flares than cometsat orbits like quasi-Hilda objects.

Some peculiarities of activity for comets with orbits on 2 - 5 AU