Gamma rays from the sun – pattern unexplained

High-energy gamma rays have been detected from the direction of our sun, but the pattern of their maximum emission seems to correspond with solar minimums in the solar cycle. Those gamma rays also seem to be emitted at the sun’s equator during the minimum, but nearer the poles outside of the minimum – this also corresponds to the movement of sun spots and possibly with coronal mass ejections, though puzzlingly only near minimums.

There is no clear theoretical explanation as yet, but the gamma rays may result from powerful cosmic rays which hit the sun resulting in a shower of gamma rays, the behaviour of which would be influenced by the sun’s magnetic field, which in turn varies with the solar cycle. Alternatively the gamma rays may originate within the sun itself.

Scientific American article