Characteristics of Four Upward-Pointing Cosmic-Ray-like Events Observed with ANITA
- Gorham, PW
- Nam, J
- Romero-Wolf, A
- Hoover, S
- Allison, P
- Banerjee, O
- Beatty, JJ
- Belov, K
- Besson, DZ
- Binns, WR
- Bugaev, V
- Cao, P
- Chen, C
- Chen, P
- Clem, JM
- Connolly, A
- Dailey, B
- Deaconu, C
- Cremonesi, L
- Dowkontt, PF
- Duvernois, MA
- Field, RC
- Fox, BD
- Goldstein, D
- Gordon, J
- Hast, C
- Hebert, CL
- Hill, B
- Hughes, K
- Hupe, R
- Israel, MH
- Javaid, A
- Kowalski, J
- Lam, J
- Learned, JG
- Liewer, KM
- Liu, TC
- Link, JT
- Lusczek, E
- Matsuno, S
- Mercurio, BC
- Miki, C
- Miočinović, P
- Mottram, M
- Mulrey, K
- Naudet, CJ
- Ng, J
- Nichol, RJ
- Palladino, K
- Rauch, BF
- Reil, K
- Roberts, J
- Rosen, M
- Rotter, B
- Russell, J
- Ruckman, L
- Saltzberg, D
- Seckel, D
- Schoorlemmer, H
- Stafford, S
- Stockham, J
- Stockham, M
- Strutt, B
- Tatem, K
- Varner, GS
- Vieregg, AG
- Walz, D
- Wissel, SA
- Wu, F
DOIAbstract
We report on four radio-detected cosmic-ray (CR) or CR-like events observed with the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload. Two of the four were previously identified as stratospheric CR air showers during the ANITA-I flight. A third stratospheric CR was detected during the ANITA-II flight. Here, we report on characteristics of these three unusual CR events, which develop nearly horizontally, 20-30 km above the surface of Earth. In addition, we report on a fourth steeply upward-pointing ANITA-I CR-like radio event which has characteristics consistent with a primary that emerged from the surface of the ice. This suggests a possible τ-lepton decay as the origin of this event, but such an...
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