Last year, we learned from Purdue physicist Ephraim Fischbach that this kept happening. He noticed a change in the radioactive decay rate of a manganese isotope, and also tied it to a solar flare that happened a night before. So that meant something came out of the sun, went through the Earth, hit a piece of manganese-54 and changed the rate at which it decays into chromium-54, spewing out ionizing particles. This also happened to an isotope called chlorine-36, in different experiments at different labs. The unusual decay change has happened during 10 solar flares since 2006, and the song remains the same.