A thing to note about the above hypothesis is that nuclear fission is assumed to take place in the corona of the Sun, and most likely in the chromosphere and photosphere as well.
Nuclear fission is an exothermic reaction for all elements heavier than iron, and quite possibly for lighter elements as well.
This means that energy is added to the external environment through fission of heavy elements. The Sun is an electrical accelerator. It has a greater output of electric energy than its input.
This in turn goes a long way in explaining where the cosmic currents originate in the first place. The source of the currents that power our Sun is other stars.