Printer friendly

What does AR stand for?

AR stands for Active Region (sunspot observation)

This definition appears very frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

See other definitions of AR

Other Resources:
We have 156 other meanings of AR in our Acronym Attic

Samples in periodicals archive:

It takes about 27 days for the sun to rotate on its axis, so an active region that forms on the far side can remain hidden for up to 13 days and surprise Earth-bound observers when it finally rotates into view.
He met Northwest Development Agency chairman Bryan Gray and fellow Io D members and regional chairmen, saying: ``I got a very clear view that the north west is a very active region and one of the parts of the UK that works well as a region with two vibrant main centres in Liverpool and Manchester.