Acknowledgements
The authors are using data from the World Wide Lightning Location
Network, a collaborative consortium of over seventy worldwide
collaborators, managed at the University of Washington. The data would
not exist but for the cooperative efforts of all of WWLLN’s
participants. For sale to researchers who are not WWLLN participants,
WWLLN data are available, at a nominal price to cover overhead costs of
running the network, and archiving / distributing the data. To find out
about such data access, see http://wwlln.net/