It collects information similar to that collected by radiosondes carried aloft by weather balloons. The 1930s saw the usage of radiosondes in tropical cyclone forecasting. The most widely used technique is launches of radiosondes. Cosmic radiation was measured by riometer and radiosondes. Sites launch radiosondes, which rise through the troposphere and well into the stratosphere. Radiosondes measuring ozone concentration are known as ozonesondes. Most radiosondes have radar reflectors and are technically rawinsondes. Radiosondes deployed in this way are called dropsondes. Experimental instruments used in atmospheric science include satellites, rocketsondes, radiosondes, weather balloons, and lasers. They used surface weather observations, radiosondes and pilot balloons (PIBALs) to determine weather conditions aloft. Today both satellites and stratospheric radiosondes are used to take measurements of the stratosphere. These batteries are used in radiosondes, missiles, projectile and bomb fuzes, and various weapon systems. Supplementing the radiosondes a network of aircraft collection is organized by the World Meteorological Organization. There is also a network of 'upper air' stations, using Radiosondes. Specialized radiosondes are used for measuring particular parameters, such as determining the ozone concentration.