Extended UK models for high frequency spectral occupancy

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Extended UK models for high frequency spectral occupancy

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Since 1982, a programme of research has undertaken the measurement, analysis, and mathematical modelling of occupancy across the entire high frequency (HF) spectrum at the times of the solstices, and this work has been published. Since the establishment of an automated, remotely controlled UK measurement system in 1989, occupancy measurements have been made at nominally fortnightly intervals. The authors present mathematical models based on these frequent measurements made during the period 1990 to 1997, when the 12-month moving average sunspot number varied from about 160 to 10. The models incorporate the parameters field strength threshold, frequency, measurement bandwidth, sunspot number and week of year.

Inspec keywords: sunspots; ionospheric electromagnetic wave propagation; HF radio propagation; field strength measurement; frequency allocation; ionospheric techniques

Other keywords: field strength threshold; remotely controlled UK measurement system; high frequency spectral occupancy; ionosphere; ITU; solstices; week; frequency; frequency allocation; mathematical modelling; research; extended UK models; HF; measurement bandwidth; moving average sunspot number

Subjects: Voltage measurement; Ionospheric electromagnetic wave propagation; Radiowave propagation; Measurement of basic electric and magnetic variables

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