South Polar in situ radio-frequency ice attenuation
South Polar in situ radio-frequency ice attenuation
复制标题
南极原位射频冰衰减
作者：
S. Barwick;D. Besson;P. Gorham;D. Saltzberg
本文测定了通过南极冰层垂直传播的射频信号在地面上反射的电场衰减长度Lα（定义为信号幅度衰减1/e的长度）。保守假设基岩场反射率为f = 380 MHz，T = -50 ° C;误差包含R的不确定性。该值与先前的估计一致，即射频衰减长度超过光学频率处的衰减长度一个数量级。
Abstract We 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.