South Polar in situ radio-frequency ice attenuation

被引:91
作者
Barwick, S [1 ]
Besson, D
Gorham, P
Saltzberg, D
机构
[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[2] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
[3] Univ Hawaii, Dept Phys, Honolulu, HI 96822 USA
[4] Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90095 USA
关键词
D O I
10.3189/172756505781829467
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
We have determined the in situ electric field attenuation length L alpha (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 R = 1.0, we estimate L-alpha = 1450(-150)(+300) M for f = 380 MHz, and T = -50 degrees 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.
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页码:231 / 238
页数:8
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