Unusual Near-horizon Cosmic-ray-like Events Observed by ANITA-IV

ANITA Collaboration, P. W. Gorham, A. Ludwig +57

ANITA's fourth long-duration balloon flight in late 2016 detected 29 cosmic-ray (CR)-like events on a background of $0.37_{-0.17}^{+0.27}$ anthropogenic events. CRs are mainly seen…