This paper presents current and electric field measurements from two t
riggered lightning flashes, 9519 and 9516, initiated by the ''classica
l'' and ''altitude'' technique, respectively, al Camp Blanding, Florid
a, in 1995. The current measurement for flash 9519 shows that the upwa
rd positive leader, initiated at the top of the grounded wire unreeled
by the triggering rocket, propagates in a discontinuous pattern made
of successive current pulses of tens to a few hundreds of amperes and
separated by intervals of 20-25 mu s. The downward negative leader in
flash 9516, initiated from the electrically floating conductor, has a
velocity greater than 1.3 x 10(5) m s(-1), a stepping interval of 18 m
u s, and step length of about 3-5 m; the associated peak currents infe
rred from the electric field steps are at least 600 A.