This video (real time) shows the effect of an oscillating electric field of varying intensity and constant frequency on a methane flame burning in air (the flame is ~15 cm tall in this case).
The field is applied via a wire electrode (shown on the left of the flame, pointed at the base of the flame), which is insulated by a glass shell, raised to a large oscillating potential.
The counterelectrode is outside the field of view and consists of a 50x50cm vertically oriented grounded plate.
The field conditions here have been chosen to show the field-dependent transition between attractive interaction and repulsive interaction.

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