Unusual Near-Horizon Cosmic-Ray-Like Events Observed By Anita-Iv

P W Gorham,A Ludwig,C Deaconu,P Cao,P Allison, O Banerjee,L Batten,D Bhattacharya,J J Beatty,K Belov,W R Binns,V Bugaev,C H Chen,P Chen,Y Chen,J M Clem,L Cremonesi, B Dailey,P F Dowkontt, B D Fox, J W H Gordon,C Hast,B Hill,S Y Hsu, J J Huang,K Hughes, R Hupe,M H Israel,T C Liu,L Macchiarulo, S Matsuno, K McBride, C Miki,J Nam, C J Naudet,R J Nichol,A Novikov,E Oberla,M Olmedo, R Prechelt,B F Rauch,J M Roberts, A Romero-Wolf, B Rotter, J W Russell,D Saltzberg,D Seckel, H Schoorlemmer, J Shiao,S Stafford, J Stockham, M Stockham, B Strutt, M S Sutherland, G S Varner,A G Vieregg,S H Wang,S A Wissel

PHYSICAL REVIEW LETTERS（2021）

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摘要

ANITA's fourth long-duration balloon flight in 2016 detected 29 cosmic-ray (CR)-like events on a background of 0.37(-0.17)(+0.27) anthropogenic events. CRs arc mainly seen in reflection off the Antarctic ice sheets, creating a phase-inverted waveform polarity. However, four of the below-horizon CR-like events show anomalous noninverted polarity, a p = 5.3 x 10(-4) chance if due to background. All anomalous events are from locations near the horizon; ANITA-IV observed no steeply upcoming anomalous events similar to the two such events seen in prior flights.

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