Publications [#283124] of Steven A. Cummer

Papers Published

1. Cummer, SA; Lu, G; Briggs, MS; Connaughton, V; Xiong, S; Fishman, GJ; Dwyer, JR, The lightning-TGF relationship on microsecond timescales, Geophysical Research Letters, vol. 38 no. 14 (July, 2011), pp. n/a-n/a, American Geophysical Union (AGU), ISSN 0094-8276 [doi]
   (last updated on 2023/06/01)

   Abstract:
   We analyze the count rates of two terrestrial gamma-ray flashes (TGFs) detected by the Fermi Gamma-ray Burst Monitor (GBM) with the broadband magnetic fields (1 to 300 kHz) produced by the simultaneous lightning processes. The microsecond-scale absolute time accuracy for these data, combined with independent geolocations of the source lightning, enable this analysis with higher accuracy than previously possible. In both events, fast discharge-like processes occur within several tens of microseconds of the gamma-ray generation, although not with a consistent relationship. The magnetic field data also show a slower signal component produced by a source current that in both events mirrors the gamma-ray count rate closely in shape and time. This indicates electromagnetic radiation directly associated with the gamma-ray generation process and thus provides a new means for probing the internal physics of this enigmatic phenomenon. Copyright 2011 by the American Geophysical Union.