Subject: Sprites and Jets

I have been fascinated by images obtained from the space shuttle of luminous 
phenomena which occur above violent thunderstorms at altitudes ranging from 
60-120 km.  They take two predominant forms: (1) well defined amorphous globs 
(sprites) and (2) funneled high velocity ejections (jets).  What is the most 
promising theory which explains their origins and phenomenology?

Re: Sprites and Jets