Spectral dependence of terrestrial gamma-ray flashes on source distance
Article first published online: 13 JAN 2009
Copyright 2009 by the American Geophysical Union.
Geophysical Research Letters
Volume 36, Issue 1, January 2009
How to Cite
2009), Spectral dependence of terrestrial gamma-ray flashes on source distance, Geophys. Res. Lett., 36, L01108, doi:10.1029/2008GL035906., , , , , , , , and (
- Issue published online: 13 JAN 2009
- Article first published online: 13 JAN 2009
- Manuscript Accepted: 24 NOV 2008
- Manuscript Revised: 17 NOV 2008
- Manuscript Received: 4 SEP 2008
- terrestrial gamma-ray flash;
 We use lightning sferics from the World Wide Lightning Location Network to identify storms near 362 Terrestrial Gamma-ray Flashes (TGFs). The combined spectrum of TGFs with storms within 300 km of the sub-satellite point is much harder than the spectrum of TGFs with more distant storms. When these data are compared with simulations of vertically oriented relativistic runaway breakdown, it is found that the most likely model has a source altitude of 15 km and a wide-beam geometry. We find four associations of TGFs with individual sferics geolocated to positions more than 300 km from the sub-satellite point and show that a narrow-beam source at ≥21 km altitude is unlikely to produce the number of high energy photons in these TGFs.