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Abstract: There is a difference between the solar ionization concentration in theionosphere in the daytime and at night-time. At night the E-region ionconcentration peak is dramatically reduced due to chemical losses and the rapidchange in the vertical polarization electric field at the time around sunset,which is due to the accelerating neutral wind dynamo and which produces acorresponding change in the zonal electric field through curl-freerequirements. The result is the formation of a layer of high conductivity, atthe daytime-night-time interface. This phenomenon in the South Atlantic AnomalySAA area, provokes an increase in the precipitation of charge particles whichis well known and is commonly termed -sunset enhancement-. In the following weshow five gamma ray burst GRB triggers observed by spacecraft GRB detectorsin temporal coincidence with muon enhancement observed at ground level by theTupi telescopes with two different orientations at $\sim 21$ UT local sunset,and located inside the SAA region. Of these GRB triggers analyzed here, onefrom Swift, and two from Fermi are probably noise triggers, produced byomni-directional particle precipitation, during the sunset enhancements.



Autor: C. R. A. Augusto, J. B. Dolival, C. E. Navia, K. H. Tsui

Fuente: https://arxiv.org/







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