The BEZERK material seemed to refer to a few new weapons systems being developed by China. One was called the SIM, which was speculated to be a "Solar Initiation Module". At first glance, this looks like it might fit the bill:
A weapon which perturbs the sun so as to produce solar flares or other emissions in a controlled manner seems a logical extension of terrestrial weather modification weapons. How in the world this would work, I have no idea.