the visible atmospheric fluorescence produced at the peak intensity of the shower; others, like Haverah Park experiment, have detected the remains of a shower by sampling the energy deposited over a large area on the ground. In particle detectors built at high-energy particle accelerators, a device called a calorimeter records the energy of particles by causing them to produce a shower and then measuring the energy deposited as a result. Many large modern detectors have both an electromagnetic calorimeter and a hadronic calorimeter, with each designed specially to produce that particular kind of shower and measure the energy of the associated type of particle. See also Air shower (physics), an extensive (many kilometres wide) cascade of ionized particles and electromagnetic radiation produced in the atmosphere when a primary cosmic ray (i.e. one of extraterrestrial origin) enters our atmosphere. Telescope Array Project MAGIC Cherenkov Telescope High Altitude Water Cherenkov Experiment Pierre Auger Observatory ATLAS experiment calorimeters CMS experiment, electromagnetic and hadronic calorimeters Collision cascade, a set of collisions between atoms in a solid References "Passage of particles through matter", from Experimental particle physics