TITLE
	Can the energy principle for MHD stability of flowing plasma be improved?

AUTHOR
	Victor ILGISONIS

ABSTRACT 
	Well-known drawback of the energy principle for flowing plasma consists in a 
	rather large gap between sufficient stability condition resulted from the 
	principle and necessary stability conditions derived for concrete modes. The 
	most suitable form of the principle obtained by Ilgisonis & Pastukhov in 1996 
	by use of the Noether theorem was then re-confirmed by Hameiri, who used 
	both the approach of direct calculations of invariants (1998) and the 
	Hamiltonian method of dynamically accessible perturbations (2003). In the 
	present report, a possibility for further improvement of the principle is 
	discussed for linearized MHD dynamics. Having been taken into account, the 
	extra invariants inherent in the linearized dynamics are shown to restrict 
	the accessible perturbations and to result effectively in more soft 
	stability condition.