Antgravity = Elves Blue jet and Red Sprite+Eletret

http://translate.google.com/translate?hl=pt-BR&sl=en&u=http://www.albany.edu/faculty/rgk/atm101/sprite.htm&sa=X&oi=translate&resnum=4&ct=result&prev=/search%3Fq%3Dred%2Bsprite%26hl%3Dpt-BR%26sa%3DG