LARGE-SCALE INSTABILITY IN GIANT MOLECULAR CLOUDS

Appearance of the large-scale instability in the magnetized slightly-i onized gas in the Giant Molecular Clouds is discussed. Cloud gas is ch aracterized by the fully developed small-scale magnetohydrodynamic hel ical turbulence. The instability analysis shows that the large-scale e ddy coherent structures may be generated in the Giant Molecular Clouds . Characteristic scale of these structures is determined by the value of the hydrodynamic helicity as well as joint influence of the drag fo rce and magnetic helicity.