Extreme total solar irradiance measurements surpassed the Solar Constant.
Ground level radiation above the extraterrestrial value lasting up to 30 min was detected.
Detailed analysis of ground-based measurements of cloud-enhanced solar irradiation in NE Brazil.
The phenomenon is not uncommon and that it occurs on at least one-third of the days in a given month.
The cumulative duration (number of 1-min consecutive events) can reach 34 min.