Brief Description:
This model provides information for HF propagation calculations at high
latitudes. It is based on the long record of worldwide riometer measurements.
The model describes the probability Q1 that the HF absorption exceeds 1dB. Q1
is a parameter important for long term predictions. Simple empirical
expressions are given for the dependence on corrected geomagnetic latitude,
longitude, and local time, solar activity (12 months smoothed sunspot number),
and season. Assuming a log-normal distribution for the cumulative absorption
probability, the authors deduce a simple linear relationship between Q1 and the
median absorption.
Availability: PC software may be available from the authors.
References:
A. J. Foppiano and P. A. Bradley, Prediction of Auroral Absorption of
High-Frequency Waves at Oblique Incidence, Telecomm. J. 50, 547, 1983.
A. J. Foppiano and P. A. Bradley, Day-to-Day Variability of Riometer Absorption, J. Atmos. Terr. Phys. 46, 689, 1984.
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