see:
>>20749849 (pb)
also isn't ozone a charged molecule?
so it would make sense that it would be drawn to one pole over the other.
my take on it was the measurements made in the early 1960s were skewed because of the outgassing of ozone from the battery packs as they discharged to power the high altitude balloons that were making the measurements.
Then when Lidar was used, that skew went away.