scholarly journals South Polar in situ radio-frequency ice attenuation

2005 ◽  
Vol 51 (173) ◽  
pp. 231-238 ◽  
Author(s):  
S. Barwick ◽  
D. Besson ◽  
P. Gorham ◽  
D. Saltzberg
Keyword(s):  
Electric Field ◽  
Radio Frequency ◽  
Signal Amplitude ◽  
Attenuation Length ◽  
Polar Ice ◽  
Order Of Magnitude ◽  
Radio Frequency Signals ◽  
South Polar

AbstractWe have determined the in situ electric field attenuation length Lα (defined as the length over which the signal amplitude diminishes by a factor 1/e) for radio-frequency signals broadcast vertically through South Polar ice and reflected off the underlying bed. Conservatively assuming a bedrock field reflectivity for f = 380 MHz, and T = –50°C; the errors incorporate uncertainties in R. This value is consistent with previous estimates that the radiofrequency attenuation length exceeds the attenuation length at optical frequencies by an order of magnitude.

scholarly journals Ross Ice Shelf (Antarctica) in situ radio-frequency attenuation

2011 ◽  
Vol 57 (201) ◽  
pp. 61-66 ◽  
Author(s):  
Taylor Barrella ◽  
Steven Barwick ◽  
David Saltzberg
Keyword(s):  
Radio Frequency ◽  
Specular Reflection ◽  
Round Trip ◽  
Attenuation Length ◽  
Ice Shelf ◽  
Ross Ice Shelf ◽  
Trip Distance ◽  
Radio Frequency Signals ◽  
Average Electric Field

AbstractWe have measured the in situ average electric field attenuation length, 〈Lα〉, for radio-frequency signals broadcast vertically through the Ross Ice Shelf, Antarctica. We chose a location, Moore Embayment, south of Minna Bluff, known for its high reflectivity at the ice–sea interface. We confirmed specular reflection and used the return pulses to measure the average attenuation length from 75–1250 MHz over the round-trip distance of 1155 m. We find 〈Lα〉 to vary from ∼500 m at 75 MHz to ∼300 m at 1250 MHz, with an experimental uncertainty of 55–15 m.

scholarly journals An in situ measurement of the radio-frequency attenuation in ice at Summit Station, Greenland

2015 ◽  
Vol 61 (229) ◽  
pp. 1005-1011 ◽  
Author(s):  
Jessica Avva ◽  
John M. Kovac ◽  
Christian Miki ◽  
David Saltzberg ◽  
Abigail G. Vieregg
Keyword(s):  
Radio Frequency ◽  
High Energy ◽  
In Situ Measurement ◽  
Ultra High Energy ◽  
Attenuation Length ◽  
Neutrino Detection ◽  
Dielectric Media ◽  
Ground Bounce ◽  
Radio Frequency Signals

AbstractWe report an in situ measurement of the electric field attenuation length Lα at radio frequencies for the bulk ice at Summit Station, Greenland, made by broadcasting radio-frequency signals vertically through the ice and measuring the relative power in the return ground bounce signal. We find the depth-averaged field attenuation length to be at 75 MHz. While this measurement has clear radioglaciological applications, the radio clarity of the ice also has implications for the detection of ultra-high energy (UHE) astrophysical particles via their radio emission in dielectric media such as ice. Assuming a reliable extrapolation to higher frequencies, the measured attenuation length at Summit Station is comparable to previously measured radio-frequency attenuation lengths at candidate particle detector sites around the world, and strengthens the case for Summit Station as a promising northern site for UHE neutrino detection.

scholarly journals Radio frequency birefringence in south polar ice and implications for neutrino reconstruction

2011 ◽  
Vol 34 (10) ◽  
pp. 755-768 ◽  
Author(s):  
I. Kravchenko ◽  
D. Besson ◽  
A. Ramos ◽  
J. Remmers
Keyword(s):  
Radio Frequency ◽  
Polar Ice ◽  
South Polar

The Radio-Frequency Birefringence of Polar Ice

1978 ◽  
Vol 21 (85) ◽  
pp. 301-313 ◽  
Author(s):  
N. D. Hargreaves
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Radio Frequency ◽  
Single Crystal ◽  
Crystal Orientation ◽  
Heterogeneous Media ◽  
Ice Crystals ◽  
Laboratory Measurements ◽  
Polar Ice

AbstractRadio-echo observations have shown that polar ice in situ is birefringent. The most likely explanation of the birefringence is an anisotropy in the radio-frequency dielectric constant of the ice single crystal, combined with the ordering of the orientations of the ice crystals in polar ice. It is possible to calculate the birefringence of ice which has a distribution of crystal orientations using a technique similar to that used to derive the dielectric properties of heterogeneous media. The experimentally observed birefringence may then be shown to be consistent with the crystal orientation fabric at the site of the observations if the anisotropy of the dielectric constant is slightly less than 1%, that is, slightly less than the accuracy of the laboratory measurements which have failed to detect any anisotropy. Further experimental observations might be used to obtain information on not only the level of anisotropy of the single crystal but also on the crystal orientation fabric of the ice.

The Radio-Frequency Birefringence of Polar Ice

1978 ◽  
Vol 21 (85) ◽  
pp. 301-313 ◽  
Author(s):  
N. D. Hargreaves
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Radio Frequency ◽  
Single Crystal ◽  
Crystal Orientation ◽  
Heterogeneous Media ◽  
Ice Crystals ◽  
Laboratory Measurements ◽  
Polar Ice

Abstract Radio-echo observations have shown that polar ice in situ is birefringent. The most likely explanation of the birefringence is an anisotropy in the radio-frequency dielectric constant of the ice single crystal, combined with the ordering of the orientations of the ice crystals in polar ice. It is possible to calculate the birefringence of ice which has a distribution of crystal orientations using a technique similar to that used to derive the dielectric properties of heterogeneous media. The experimentally observed birefringence may then be shown to be consistent with the crystal orientation fabric at the site of the observations if the anisotropy of the dielectric constant is slightly less than 1%, that is, slightly less than the accuracy of the laboratory measurements which have failed to detect any anisotropy. Further experimental observations might be used to obtain information on not only the level of anisotropy of the single crystal but also on the crystal orientation fabric of the ice.

scholarly journals Measurement uncertainty in broadband radiofrequency radiation level measurements

2014 ◽  
Vol 29 (1) ◽  
pp. 53-57
Author(s):  
Branislav Vulevic ◽  
Cedomir Belic ◽  
Luka Perazic
Keyword(s):  
Electric Field ◽  
Radio Frequency ◽  
Measurement Uncertainty ◽  
Residential Areas ◽  
Radiation Level ◽  
New Approach ◽  
Radio Frequency Radiation ◽  
Broadband Radio ◽  
Frequency Radiation

For the evaluation of measurement uncertainty in the measurement of broadband radio frequency radiation, in this paper we propose a new approach based on the experience of the authors of the paper with measurements of radiofrequency electric field levels conducted in residential areas of Belgrade and over 35 municipalities in Serbia. The main objective of the paper is to present practical solutions in the evaluation of broadband measurement uncertainty for the in-situ RF radiation levels.

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