For the record

New Scientist - 05 November 2008 - Magazine issue 2681 - page 21

Several readers expressed surprise at our report of meteorologists at the University of Reading detecting gravity waves in the jet stream (11 October, p 23). To resolve any ambiguity: fluid dynamicists have been talking about "gravity waves" at the interface of air masses (or air and water) since the 1950s at least. These are quite distinct from the gravitational waves posited by cosmologists.