HF Radio Noise in the Topside Ionosphere

Charles M. Rush; Rayner K. Rosich; Carlene M. Mellecker

Abstract: Radio noise of ground-based origin can be observed by a satelliteborne receiver orbiting above the 2 region. The noise that is observed is a function of receiver frequency, satellite position, and local time at the sub-satellite point. A recently launched Defense Meteorological Satellite is equipped with a swept-frequency, high-frequency (HF) noise receiver and currently is providing data on a routine basis all along the satellite orbit. The receiver provides measurements of radio noise of terrestrial origin every 100 kHz in the frequency range 1.2 to 13.9 MHz. In this report, we discuss the characteristics of the noise environment as observed by the satellite durinq periods surr-ound inq local dawn and local dusk.

Keywords: DMSP Satellite; HF propagation; HF radio noise; spectrum utilization

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Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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