Negative flashes?

Allen Thomson (thomsona@flash.net)
Wed, 21 Apr 1999 09:01:36 -0500

Jari (finn@main.jetnet.ab.ca) , who, at 54.25N, 110.11W, is a long way from
Finland, reported,

>As a bonus while watching ADEOS #24277, i noticed a bright flash to the
>South at 04:55:02 and saw the object at 1x, mag 3.6 est and it continued to
>produce negative flashes all the while being visible.

Sorry that I'm not up on flash terminology, but are "negative flashes" an
absence of spikes in the light curve, a presence of notches, or something
else?