Observation of classically `forbidden' electromagnetic wave propagation and implications for neutrino detection.
Ongoing experimental efforts in Antarctica seek to detect ultra-high energy neutrinos by measurement of radio-frequency (RF) Askaryan radiation generated by the collision of a neutrino with an ice molecule. An array of RF antennas, deployed either in-ice or in-air, is used to infer the properties of...
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ftcdlib:oai:escholarship.org:ark:/13030/qt46b1j5cw 2023-06-18T03:38:17+02:00 Observation of classically `forbidden' electromagnetic wave propagation and implications for neutrino detection. Barwick, SW Berg, EC Besson, DZ Gaswint, G Glaser, C Hallgren, A Hanson, JC Klein, SR Kleinfelder, S Köpke, L Kravchenko, I Lahmann, R Latif, U Nam, J Nelles, A Persichilli, C Sandstrom, P Tatar, J Unger, E 055 - 055 2018-07-01 https://escholarship.org/uc/item/46b1j5cw unknown eScholarship, University of California qt46b1j5cw https://escholarship.org/uc/item/46b1j5cw public Journal of Cosmology and Astroparticle Physics, vol 2018, iss 07 cosmic ray experiments ultra high energy photons and neutrinos Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Nuclear & Particles Physics article 2018 ftcdlib 2023-06-05T17:59:49Z Ongoing experimental efforts in Antarctica seek to detect ultra-high energy neutrinos by measurement of radio-frequency (RF) Askaryan radiation generated by the collision of a neutrino with an ice molecule. An array of RF antennas, deployed either in-ice or in-air, is used to infer the properties of the neutrino. To evaluate their experimental sensitivity, such experiments require a refractive index model for ray tracing radio-wave trajectories from a putative in-ice neutrino interaction point to the receiving antennas; this gives the degree of signal absorption or ray bending from source to receiver. The gradient in the density profile over the upper 200 meters of Antarctic ice, coupled with Fermat's least-time principle, implies ray "bending" and the existence of "forbidden" zones for predominantly horizontal signal propagation at shallow depths. After re-deriving the formulas describing such shadowing, we report on experimental results that, somewhat unexpectedly, demonstrate the existence of electromagnetic wave transport modes from nominally shadowed regions. The fact that this shadow-signal propagation is observed both at South Pole and the Ross Ice Shelf in Antarctica suggests that the effect may be a generic property of polar ice, with potentially important implications for experiments seeking to detect neutrinos. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf Ross Ice Shelf South pole South pole University of California: eScholarship Antarctic Ross Ice Shelf South Pole |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
cosmic ray experiments ultra high energy photons and neutrinos Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Nuclear & Particles Physics |
spellingShingle |
cosmic ray experiments ultra high energy photons and neutrinos Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Nuclear & Particles Physics Barwick, SW Berg, EC Besson, DZ Gaswint, G Glaser, C Hallgren, A Hanson, JC Klein, SR Kleinfelder, S Köpke, L Kravchenko, I Lahmann, R Latif, U Nam, J Nelles, A Persichilli, C Sandstrom, P Tatar, J Unger, E Observation of classically `forbidden' electromagnetic wave propagation and implications for neutrino detection. |
topic_facet |
cosmic ray experiments ultra high energy photons and neutrinos Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Nuclear & Particles Physics |
description |
Ongoing experimental efforts in Antarctica seek to detect ultra-high energy neutrinos by measurement of radio-frequency (RF) Askaryan radiation generated by the collision of a neutrino with an ice molecule. An array of RF antennas, deployed either in-ice or in-air, is used to infer the properties of the neutrino. To evaluate their experimental sensitivity, such experiments require a refractive index model for ray tracing radio-wave trajectories from a putative in-ice neutrino interaction point to the receiving antennas; this gives the degree of signal absorption or ray bending from source to receiver. The gradient in the density profile over the upper 200 meters of Antarctic ice, coupled with Fermat's least-time principle, implies ray "bending" and the existence of "forbidden" zones for predominantly horizontal signal propagation at shallow depths. After re-deriving the formulas describing such shadowing, we report on experimental results that, somewhat unexpectedly, demonstrate the existence of electromagnetic wave transport modes from nominally shadowed regions. The fact that this shadow-signal propagation is observed both at South Pole and the Ross Ice Shelf in Antarctica suggests that the effect may be a generic property of polar ice, with potentially important implications for experiments seeking to detect neutrinos. |
format |
Article in Journal/Newspaper |
author |
Barwick, SW Berg, EC Besson, DZ Gaswint, G Glaser, C Hallgren, A Hanson, JC Klein, SR Kleinfelder, S Köpke, L Kravchenko, I Lahmann, R Latif, U Nam, J Nelles, A Persichilli, C Sandstrom, P Tatar, J Unger, E |
author_facet |
Barwick, SW Berg, EC Besson, DZ Gaswint, G Glaser, C Hallgren, A Hanson, JC Klein, SR Kleinfelder, S Köpke, L Kravchenko, I Lahmann, R Latif, U Nam, J Nelles, A Persichilli, C Sandstrom, P Tatar, J Unger, E |
author_sort |
Barwick, SW |
title |
Observation of classically `forbidden' electromagnetic wave propagation and implications for neutrino detection. |
title_short |
Observation of classically `forbidden' electromagnetic wave propagation and implications for neutrino detection. |
title_full |
Observation of classically `forbidden' electromagnetic wave propagation and implications for neutrino detection. |
title_fullStr |
Observation of classically `forbidden' electromagnetic wave propagation and implications for neutrino detection. |
title_full_unstemmed |
Observation of classically `forbidden' electromagnetic wave propagation and implications for neutrino detection. |
title_sort |
observation of classically `forbidden' electromagnetic wave propagation and implications for neutrino detection. |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/46b1j5cw |
op_coverage |
055 - 055 |
geographic |
Antarctic Ross Ice Shelf South Pole |
geographic_facet |
Antarctic Ross Ice Shelf South Pole |
genre |
Antarc* Antarctic Antarctica Ice Shelf Ross Ice Shelf South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Ross Ice Shelf South pole South pole |
op_source |
Journal of Cosmology and Astroparticle Physics, vol 2018, iss 07 |
op_relation |
qt46b1j5cw https://escholarship.org/uc/item/46b1j5cw |
op_rights |
public |
_version_ |
1769003239610515456 |