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Direct D‐layer Reflection as a Factor in Oblique Propagation on the Lower High Frequencies
Author(s) -
Bain W. F.,
Buckley R. J.
Publication year - 1969
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs004i005p00419
Subject(s) - oblique case , reflection (computer programming) , optics , physics , absorption (acoustics) , computational physics , range (aeronautics) , materials science , philosophy , linguistics , computer science , composite material , programming language
Recently available D‐region profiles are used to determine a model in which direct D‐region reflection is assumed to be the dominant daylight mode in the 2‐ to 5‐MHz region. This model is applied to the calculation of daylight absorption as a function of frequency and path length at oblique incidence. Good agreement with measurement is found, in contrast to early absorption calculation techniques, which show discrepancies of up to 50 decibels in this frequency range. Evidence suggesting direct D‐region reflection higher in the HF band is presented.