2021
DOI: 10.1103/physrevlett.126.071103
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Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV

Abstract: ANITA's fourth long-duration balloon flight in 2016 detected 29 cosmic-ray (CR)-like events on a background of 0.37 þ0.27 −0.17 anthropogenic events. CRs are 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 ¼ 5.3 × 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 t… Show more

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Cited by 25 publications
(66 citation statements)
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“…As we mentioned above, our main arguments leading to the identification of the MMEs with the AQN events are not based on an order of magnitude estimate of the frequency of appearance (16). Rather, our main arguments are based on specific qualitative features (formulated as puzzles) and which cannot be explained in terms of the conventional CR air showers.…”
Section: Event Rate Of Mmementioning
confidence: 88%
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“…As we mentioned above, our main arguments leading to the identification of the MMEs with the AQN events are not based on an order of magnitude estimate of the frequency of appearance (16). Rather, our main arguments are based on specific qualitative features (formulated as puzzles) and which cannot be explained in terms of the conventional CR air showers.…”
Section: Event Rate Of Mmementioning
confidence: 88%
“…The final example we want to mention here is the observation by ANITA [14][15][16] of two anomalous events with noninverted polarity. These two events had been identified as the Earth emergent upward going CR-like events with exit angles of −27 0 and −35 0 relative to the horizon.…”
Section: 2mentioning
confidence: 99%
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