Cracking on
Question: Some days ago I was standing underneath the flight path taken by
aircraft landing at Dublin Airport.
I noticed that after a plane had passed overhead and landed, an audible
crackling noise could be heard moving directly above me, in the same direction
as the aircraft.
The sound was not unlike high-pitched thunder, and didn’t arrive until up to
a minute after the plane passed overhead. In some cases it was accompanied by
ribbons of vapour, which floated downwards and then dissipated. This was more
noticeable with larger aircraft.
What is responsible for this phenomenon, and why…
