intracloud and cloud-to-ground lightning, but because it observes
variations in the local vertical electric field, the system is more susceptible to vertical (cloud-
to-ground) lightning. Detailed
description of the ATDnet system and its use in monitoring
volcanic lightning is given by Gaffard et al. (2008), Bennett et al. (2010), and Arason et al.
(2011).
8
Figure 2. The out-stations
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