Atmosphere of Earth they penetrate more deeply. The various layers of Earth's ionosphere, important to HF radio propagation, begin below 100 km and extend beyond 500 km. By comparison, the International Space Station and Space Shuttle typically orbit at 350–400 km, within the F-layer of the ionosphere where they encounter enough atmospheric drag to require reboosts every few months. Depending on solar activity, satellites can experience noticeable atmospheric drag at altitudes as high as 700–800 km. The division of the atmosphere into layers mostly by reference to temperature is discussed above. Temperature decreases with altitude starting at sea level, but variations in this
Waves Radio Waves Radio Waves Radio is a local radio station based in Peterhead, North East Scotland. The station is on air 24 hours a day with live shows from 6am till 10pm (apart from "a wave of hits" from 6pm-7pm on weekdays which is automated). Waves Radio was born in 1990 after its founder and owner known as Kenny King applied to the then Radio Authority for an RSL licence. The station in the early years was known as Waves AM broadcasting by means of Restricted Service Licences from a studio at the Lido beach area in Peterhead, during the towns