Subject: Why does only one half of the pickle light up during experiment?

If you plug a pickle into a 110 volt outlet it will emit a yellow light. The experiment works best if you put nails into the ends of the pickle, then connect the nails to both the wires comming from an extention cord. Of course the pickle needs to be suspended. When the pickle is plugged in it will fizzle and glow with a yellowish hue. Is the light emitted caused by the de-excitation of sodium atoms? Why does only one half of the pickle light up at one time- the light alternates between halves? Does alternating current have anything to do with it? Thanks.

Re: Why does only one half of the pickle light up during experiment?