The lightning-TGF relationship on microsecond timescales
Article first published online: 28 JUL 2011
Copyright 2011 by the American Geophysical Union.
Geophysical Research Letters
Volume 38, Issue 14, July 2011
How to Cite
2011), The lightning-TGF relationship on microsecond timescales, Geophys. Res. Lett., 38, L14810, doi:10.1029/2011GL048099., , , , , , and (
- Issue published online: 28 JUL 2011
- Article first published online: 28 JUL 2011
- Manuscript Accepted: 14 JUN 2011
- Manuscript Revised: 13 JUN 2011
- Manuscript Received: 10 MAY 2011
- terrestrial gamma-ray flash
 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.