The video that came up right afterwords was on Solar Flares and Coronal Mass Ejections (CMEs), something much closer to what we study with BARREL.
BARREL looks at some of the effects of CMEs and solar flares on our magnetosphere by looking indirectly for particle precipitation due to solar storms. One might compare our measurements to that of a rain gauge, just like a rain gauge estimates how much precipitation occurred during a thunderstorm, we're looking at how much precipitation occurred during a geomagnetic storm. However, instead of collecting rain drops, we collect x-rays which are a byproduct of electrons hitting our upper atmosphere. The x-ray counts are then a proxy for how many electrons precipitated into the atmosphere.