The main problem is that scientist determined that the sun has little variation because they measured visible light and total radiance and made their determination for insignificant variation. Thus they ignored solar affects on the ozone concentration even though ozone in the upper atmosphere is created by UV light from the sun. Their determination for insignificant solar change is now proven incorrect. We have since discovered that UV radiance can vary by more then 50 % during a solar cycle. The problem now is that science has become so corrupt with politics, that it lacks the integrity to admit its own faults.
Ozone is a form of oxygen with the chemical formula O3 that is formed when O2 is affected by UV radiation from Sunlight. What is there very little of over the poles during the winter periods? You know that - Sunlight.