Fermi GBM Observations of the unusual Terrestrial Gamma-ray Flash 091214

Details Fermi GBM Observations of the unusual Terrestrial Gamma-ray Flash 091214 Fermi GBM Observations of the unusual Terrestrial Gamma-ray Flash 091214

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.2707b&link_type=abstract

American Astronomical Society, HEAD meeting #11, #27.07

Astronomy and Astrophysics

Astronomy

Scientific paper

On 2009 December 14 GBM detected an unusual Terrestrial Gamma-ray Flash (TGF), which was more than sixty times longer than the typical TGF. Additionally, a 511 keV position annihilation line is present in the spectrum and the time history has a second peak that is well explained by magnetic mirroring of TGF-produced electrons and positrons in the Earth's magnetic field. These features strongly confirm that a small fraction of TGFs are detected not as gamma-rays, but rather as electrons and positions traveling along magnetic field lines and directly incident on the spacecraft.

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