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Terrestrial Gamma-ray Flash (TGFs) Above ThunderstormsTerrestrial gamma-ray flashes (TGFs) are being observed with the Gamma-ray Burst Monitor (GBM) detectors on Fermi about once every four weeks. These intense millisecond flashes of MeV photons have been observed with four space-borne experiments since their initial discovery by the BATSE-CGRO experiment in the early 1990s. TGFs have extremely hard spectra (harder than GRBs) and photons are seen to extend to over 30 MeV. The GBM-Fermi observations have the highest temporal resolution of any previous TGF observations and time-resolved coarse spectra can be derived. These features will be crucial for testing the leading current model of TGF production: relativistic run-away electron cascades formed in the intense electric fields within thunderstorms.
Document ID
20090042971
Acquisition Source
Marshall Space Flight Center
Document Type
Abstract
Authors
Fishman, Gerald J. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 24, 2013
Publication Date
November 2, 2009
Subject Category
Astrophysics
Report/Patent Number
M10-0006
Report Number: M10-0006
Meeting Information
Meeting: 2009 Fermi Symposium
Location: Washington, DC
Country: United States
Start Date: November 2, 2009
End Date: November 5, 2009
Sponsors: NASA Goddard Space Flight Center
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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