Spectral (600–1050 nm) time exposures (99.6μs) of a lightning stepped leader

A downward positive leader that radiated optical pulses like a negative stepped leader

(2011) D. Wang et al.   JOURNAL OF GEOPHYSICAL RESEARCH

Observations of stepping mechanisms in a rocket-and-wire triggered lightning flash

(2010) C. J. Biagi et al.   JOURNAL OF GEOPHYSICAL RESEARCH

High-speed video observations of positive lightning flashes to ground

(2010) Marcelo M. F. Saba et al.   JOURNAL OF GEOPHYSICAL RESEARCH

High-speed video observations of positive ground flashes produced by intracloud lightning

(2009) Marcelo M. F. Saba et al.   GEOPHYSICAL RESEARCH LETTERS

High-speed video observations of rocket-and-wire initiated lightning

(2009) C. J. Biagi et al.   GEOPHYSICAL RESEARCH LETTERS

An Overview of Lightning Locating Systems: History, Techniques, and Data Uses, With an In-Depth Look at the U.S. NLDN

(2009) Kenneth L. Cummins et al.   IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY

Positive leader characteristics from high-speed video observations

(2008) Marcelo M. F. Saba et al.   GEOPHYSICAL RESEARCH LETTERS