Abstract
The m =1 mode of perturbation is artificially introduced by a parallel displacement of the driving field. The plasma is found to be stabilized against the m =1 mode. The stabilizing effect is due to the plasma near and outside the mirror points which is frozen on outwardly concave lines of force; the effect is not the so-called line tying effect. Exclusion of the exterior plasma by glass plates results in this conclusion. An inclined glass plate pushed the plasma column toward the side of the obtuse angle between its surface and the field lines. A funnel shaped glass cone has a stabilizing effect.
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