A Fermi Gamma‐Ray Burst Monitor Event Observed as a Terrestrial Gamma‐Ray Flash and Terrestrial Electron Beam. Issue 12 (19th December 2019)

• Record Type: Journal Article
• Authors: Stanbro, M.; Briggs, M. S.; Roberts, O. J.; Cramer, E.; Dwyer, J. R.; Holzworth, R.H.; Mailyan, B. G.; Xiong, S. L.
• Is Part Of: Journal of geophysical research. Volume 124:Issue 12(2019)
• Page Start: 10580
• Page End: 10591
• Publication Date: 2019-12-19
• Subjects: terrestrial gamma‐ray flash -- terrestrial electron beam -- Fermi GBM -- lightning; Magnetospheric physics -- Periodicals; Space environment -- Periodicals; Cosmic physics -- Periodicals; Planets -- Atmospheres -- Periodicals; Heliosphere (Astrophysics) -- Periodicals; Geophysics -- Periodicals; 523.01
• DOI: 10.1029/2019JA026749
• Languages: English
• ISSNs: 2169-9380

Abstract

Abstract: We present an event that was detected by Fermi Gamma‐ray Burst Monitor on 4 February 2014 as the spacecraft was flying over Madagascar. We interpret the three pulses during this event (herein known as 140204581) as the following: the first pulse as a terrestrial gamma‐ray flash, the second as a 2 ms long terrestrial electron beam (TEB) 0.5 ms after the terrestrial gamma‐ray flash, and the last pulse as the TEB mirror pulse 90 ms after the TEB. The nature of these events were confirmed using both the World Wide Lightning Location Network and the Earth Networks Total Lightning Network, which detected the same simultaneous sferic underneath the spacecraft and in the magnetic footprint. Several models were fit to the data, and results show that the vertical narrow beam model was found to be inconsistent with the data. Key Points: Fermi GBM observed an event in both gamma‐rays from a TGF and charged particles from a (TEB) Simulations show observations of the event are consistent with an origin identified by radio networks The best fit positron fraction for the TEB is about 10%