In this chapter we describe the application of the Fly's Eye (Section 3.4)
to the detection and characterization of elves.
Section 4.1 deals with methods of identifying elves
based on their optical characteristics, and subsequent sections report
statistical data on observed elves. Results are fully consistent with
the theoretical model described in Section 2.5 and suggest a lightning peak current threshold
near 
60 kA for the excitation of optically detectable elves.