BibTex format
@article{Alden:2026:10.1103/xwqy-yzrk,
author = {Alden, N and Ali, S and Allison, P and Archambault, S and Beatty, JJ and Besson, DZ and Bishop, A and Chen, P and Chen, YC and Chen, YC and Chiche, S and Clark, BA and Connolly, A and Couberly, K and Cremonesi, L and Cummings, A and Dasgupta, P and Debolt, R and De, Kockere S and De, Vries KD and Deaconu, C and DuVernois, MA and Flaherty, J and Friedman, E and Gaior, R and Giri, P and Hanson, J and Harty, N and Hoffman, KD and Huang, MH and Hughes, K and Ishihara, A and Karle, A and Kelley, JL and Kim, KC and Kim, MC and Kravchenko, I and Krebs, R and Kuo, CY and Kurusu, K and Latif, UA and Liu, CH and Liu, TC and Luszczak, W and Machtay, A and Mase, K and Muzio, MS and Nam, J and Nichol, RJ and Novikov, A and Nozdrina, A and Oberla, E and Pai, CW and Pan, Y and Pfendner, C and Punsuebsay, N and Roth, J and Salcedo-Gomez, A and Seckel, D and Seikh, MFH and Shiao, YS and Stethem, J and Su, SC and Toscano, S and Torres, J and Touart, J and Van, Eijndhoven N and Vieregg, A and Vilarino, F},
doi = {10.1103/xwqy-yzrk},
journal = {Physical Review Letters},
title = {Observation of In-Ice Askaryan Radiation from High-Energy Cosmic Rays},
url = {http://dx.doi.org/10.1103/xwqy-yzrk},
volume = {136},
year = {2026}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - We present the first experimental evidence for in-ice Askaryan radiation—coherent charge-excess radio emission—from high-energy particle cascades developing in the Antarctic ice sheet. In 208 days of data recorded with the phased array instrument of the Askaryan Radio Array, a previous analysis has incidentally identified 13 events with impulsive radio frequency signals originating from below the ice surface. We here present a detailed reanalysis of these events. The observed event rate, radiation arrival directions, signal shape, spectral content, and electric field polarization are consistent with in-ice Askaryan radiation from cosmic ray air shower cores impacting the ice sheet. For the brightest events, the angular radiation pattern favors an extended cascadelike emitter over a pointlike source. An origin from the geomagnetic separation of charges in cosmic ray air showers is disfavored by the arrival directions and polarization. Considering the arrival angles, timing properties, and impulsive nature of the passing events, the event rate is inconsistent with the estimation of the combined background from thermal noise events and on-surface events at the level of 5.1σ.
AU - Alden,N
AU - Ali,S
AU - Allison,P
AU - Archambault,S
AU - Beatty,JJ
AU - Besson,DZ
AU - Bishop,A
AU - Chen,P
AU - Chen,YC
AU - Chen,YC
AU - Chiche,S
AU - Clark,BA
AU - Connolly,A
AU - Couberly,K
AU - Cremonesi,L
AU - Cummings,A
AU - Dasgupta,P
AU - Debolt,R
AU - De,Kockere S
AU - De,Vries KD
AU - Deaconu,C
AU - DuVernois,MA
AU - Flaherty,J
AU - Friedman,E
AU - Gaior,R
AU - Giri,P
AU - Hanson,J
AU - Harty,N
AU - Hoffman,KD
AU - Huang,MH
AU - Hughes,K
AU - Ishihara,A
AU - Karle,A
AU - Kelley,JL
AU - Kim,KC
AU - Kim,MC
AU - Kravchenko,I
AU - Krebs,R
AU - Kuo,CY
AU - Kurusu,K
AU - Latif,UA
AU - Liu,CH
AU - Liu,TC
AU - Luszczak,W
AU - Machtay,A
AU - Mase,K
AU - Muzio,MS
AU - Nam,J
AU - Nichol,RJ
AU - Novikov,A
AU - Nozdrina,A
AU - Oberla,E
AU - Pai,CW
AU - Pan,Y
AU - Pfendner,C
AU - Punsuebsay,N
AU - Roth,J
AU - Salcedo-Gomez,A
AU - Seckel,D
AU - Seikh,MFH
AU - Shiao,YS
AU - Stethem,J
AU - Su,SC
AU - Toscano,S
AU - Torres,J
AU - Touart,J
AU - Van,Eijndhoven N
AU - Vieregg,A
AU - Vilarino,Fostier M
AU - Wang,MZ
AU - Wang,SH
AU - Windischhofer,P
AU - Wissel,SA
AU - Xie,C
AU - Yoshida,S
AU - Young,R
DO - 10.1103/xwqy-yzrk
PY - 2026///
SN - 0031-9007
TI - Observation of In-Ice Askaryan Radiation from High-Energy Cosmic Rays
T2 - Physical Review Letters
UR - http://dx.doi.org/10.1103/xwqy-yzrk
VL - 136
ER -