Adiri time evolution. Cassini ISS monitoring of the evolution of altered surface areas within Adiri from 2010 through 2011. These brightenings were initially reported by Turtle et al. 2011  from the 2011 January 15 observation. After darkening in at least one of the areas right after the event on 2010 October 29, the pattern of brightening afterward shows an initially maximum extent that shrinks over the ensuing months. Some darkening of dunes occured between Adiri and Concordia Regio as well.