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dc.contributor.authorKochkin, Pavlo
dc.contributor.authorSarria, David
dc.contributor.authorSkeie, Chris Alexander
dc.contributor.authorVan Deursen, Alexander P.J.
dc.contributor.authorde Boer, A
dc.contributor.authorBardet, Michiel
dc.contributor.authorAllasia, Cedric
dc.contributor.authorFlourens, Franck
dc.contributor.authorØstgaard, Nikolai
dc.PublishedKochkin P, Sarria D, Skeie CA, Van Deursen AP, de Boer A, Bardet M, Allasia C, Flourens F, Østgaard N. In‐Flight Observation of Positron Annihilation by ILDAS. Journal of Geophysical Research - Atmospheres. 2018;123(15):8074-8090eng
dc.description.abstractWe report a 511‐keV photon flux enhancement that was observed inside a thundercloud and is a result of positron annihilation. The observation was made with the In‐flight Lightning Damage Assessment System (ILDAS) on board of an A340 test aircraft. The aircraft was intentionally flying through a thunderstorm at 12‐km altitude over Northern Australia in January 2016. Two gamma ray detectors showed a significant count rate increase synchronously with fast electromagnetic field variations registered by an on‐board antenna. A sequence of 10 gamma ray enhancements was detected, each lasted for about 1 s. Their spectrum mainly consists of 511‐keV photons and their Compton component. The local electric activity during the emission was identified as a series of static discharges of the aircraft. A full‐scale Geant4 model of the aircraft was created to estimate the emission area. Monte Carlo simulation indicated that the positrons annihilated in direct vicinity or in the aircraft body.en_US
dc.rightsAttribution CC BY-NC-NDeng
dc.titleIn‐Flight Observation of Positron Annihilation by ILDASen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2018 The Author(s)en_US
dc.source.journalJournal of Geophysical Research - Atmospheres
dc.relation.projectNotur/NorStore: NN9526K

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