A new type of propagating perturbations on a vortex filament - traveli
ng vortex breakdown has been observed experimentally. A method of cont
rolled external action on a vortex flow with known parameters is used.
Data are obtained on the absolute propagation velocity of the perturb
ations as a function of the conditions in the vortex chamber, which de
termine the vortex characteristics. (C) 1997 American Institute of Phy
sics. [S1063-7850(97)02211-8].