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16 April 2024 |
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Radio-frequency Attenuation Length, Basal-Reflectivity, Depth, and Polarization Measurements from Moore's Bay in the Ross Ice-Shelf | | S.W. Barwick
; E.C. Berg
; D. Besson
; T. Duffin
; J. C. Hanson
; S.R. Klein
; S.A. Kleinfelder
; C. Reed
; M. Roumi
; T. Stezelberger
; J. Tatar
; J. Walker
; L. Zou
; | | Date: |
27 Oct 2014 | | Abstract: | Radio-glaciological parameters from Moore’s Bay, in the Ross Ice Shelf, have
been measured. The thickness of the ice shelf in Moore’s Bay was measured from
reflection times of radio-frequency pulses propagating vertically through the
shelf and reflecting from the ocean. The average depth obtained is $576pm8$ m.
The temperature-averaged attenuation length of the ice column, $langle L
angle$, is derived from the returned power assuming 100\% reflection. A
linear fit to the data yields $langle L(
u)
angle =
(460pm20)-(180pm40)
u$, for the frequencies $
u=$[0.100-0.850] GHz, at 95%
confidence. Introducing a baseline of 543$pm$7 m between radio transmitter and
receiver allowed the computation of the basal reflection coefficient, $R$,
separately from attenuation. The electric-field reflection coefficient is
$sqrt{R}=0.82pm0.07$ across [0.100-0.850] GHz. Finally, the reflected power
rotated into the orthogonal antenna polarization is less than 5% below 0.400
GHz, compatible with air propagation. These results suggest that Moore’s Bay
will serve as an appropriate medium for the ARIANNA high energy neutrino
telescope. | | Source: | arXiv, 1410.7134 | | Services: | Forum | Review | PDF | Favorites | |
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