  Some Be stars display important variability of the strength of the emission
lines formed in their disk. This is notably the case of pi Aqr. We present here
the recent evolution of the Be disk in this system thanks to spectra collected
by amateur spectroscopists since the end of 2013. A large transition occurred:
the emission linked to the Be disk nearly disappeared in January 2014, but the
disk has recovered, with a line strength now reaching levels only seen during
the active phase of 1950--1990. In parallel to this change in strength occurs a
change of disk structure, notably involving the disappearance of the strong
asymmetry responsible for the V/R modulation.

Solar and Stellar Astrophysics