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I suggest that the main process that amplifies magnetic fields in coolingflows in clusters and group of galaxies is a jet-driven dynamo (JEDD). The mainprocesses that are behind the JEDD is the turbulence that is formed by the manyvortices formed in the inflation processes of bubbles, and the large scaleshear formed by the propagating jet. It is sufficient that a strong turbulenceexits in the vicinity of the jets and bubbles, just where the shear is large.The typical amplification time of magnetic fields by the JEDD near the jets andbubbles is approximately hundred million years. The amplification time in theentire cooling flow region is somewhat longer. The vortices that create theturbulence are those that also transfer energy from the jets to theintra-cluster medium, by mixing shocked jet gas with the intra-cluster mediumgas, and by exciting sound waves. The JEDD model adds magnetic fields to thecyclical behavior of energy and mass in the jet-feedback mechanism (JFM) incooling flows.

A jet-driven dynamo (JEDD) from jets-inflated bubbles in cooling flows