Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV
Journal Article
·
· Physical Review Letters
ANITA’s fourth long-duration balloon flight in 2016 detected 29 cosmic-ray (CR)-like events on a background of 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 chance if due to background. Furthermore, 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.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Aeronautics and Space Administration (NASA); Taiwan Ministry of Science and Technology (MOST)
- Contributing Organization:
- ANITA Collaboration
- Grant/Contract Number:
- AC02-76SF00515; NNX15AC24G; 106-2119-M-002-011
- OSTI ID:
- 1777246
- Journal Information:
- Physical Review Letters, Vol. 126, Issue 7; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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