Fermi observations of Terrestrial Gamma-ray Flashes (TGFs)
16
10th AGILE Workshop 1 Fermi observations of Terrestrial Gamma-ray Flashes (TGFs) Michael S. Briggs (UAHuntsville) and the GBM Team
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Transcript of Fermi observations of Terrestrial Gamma-ray Flashes (TGFs)
10th AGILE Workshop! 1!
Fermi observations ofTerrestrial Gamma-ray Flashes
(TGFs)!
Michael S. Briggs!(UAHuntsville)!
and the GBM Team!!
Max-Planck-Institut für !extraterrestrische Physik!
NASA!Marshall Space Flight
Center!!
University of Alabama!
in Huntsville!!
The current GBM Team: Narayana Bhat, Michael Briggs, Michael Burgess, Vandiver Chaplin, Bill Cleveland, Valerie Connaughton, Roland Diehl, Steve Elrod, Mark Finger, Jerry Fishman, Gerard Fitzgerald, Suzanne Foley, Lisa Gibby, Misty Giles, Adam Goldstein, Jochen Greiner, David Gruber, Alexander van der Horst, Andreas von Kienlin, Pete Jenke, Marc Kippen, Chryssa Kouveliotou, Emily Layden, Sheila McBreen, Sinead McGlynn, Chip Meegan, Bill Paciesas, Veronique Pelassa, Rob Preece, Arne Rau, Dave Tierney, Colleen Wilson-Hodge and Shaolin Xiong.!!
! !Others before launch: Giselher Lichti, Fred Berry, Ron Cantrell, ! ! !Al English, Fred Kroeger, …!!
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University College !Dublin!
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Briggs, et al., JGR, 2010!Foley, et al., in preparation!
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X - 28 CONNAUGHTON ET AL.: GBM TGFS AND WWLLN
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TGF 100207.843
Figure 1. GBM TGF lightcurves (histogram), corrected for light travel time and clock
drift, with WWLLN stroke time and uncertainty band (dotted).
D R A F T July 14, 2010, 6:37pm D R A F T
Correlating TGFs in gamma-rays (GBM) !with lightning via radio (WWLLN)!
é! é!
é! é!
When a !match is found:!!Tens of μs !and! <≈ 300 km!
Connaughton !et al., JGR, 2010!
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WWLLN lightning locations (Connaughton, et al., JGR, 2010)!!
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Cummer et al.,!GRL, 2011!
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bn091214495All 14 GBM DetectorsChannels 0 to 127
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Briggs, et al, GRL, 2011!
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Currently 236 (triggered) TGFs!!The TGF rate since the Flight Software was improved (2009 Nov 10): one per 4.0 days.!!But as Oliver Twist said, “Please sir, I want some more.”!
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Fermi Tracks on year 2010, month 8, day 1
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Currently ~700 TGFs.!!“Please sir, I want some more.”!!Fermi and GBM have permission to produce GBM TTE data all the time!!We predict ≈800 TGFs per year.!
http://gammaray.nsstc.nasa.gov/publications/tgf_journal.html!
