William B. Jones; D. H. Zacharisen

Abstract: Worldwide atmospheric noise at 1 MHz, as presented in CCIR Report 3 22 (1963), has been numerically mapped in universal time. The mapping technique and representative contour maps for January and July, are presented. Fourier analyses were performed separately on the periodic functions that represent the longitudinal and diurnal variations of the data. The latitudinal variation is represented by a weighted least-squares polynomial in the sine of the latitude. This method provides an improved numerical representation of the atmospheric noise with fewer coefficients than were required previously.

Keywords: HF propagation; ionospheric propagation; atmospheric noise; least-squares fitting; numerical maps; universal time; ionospheric predictions

To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572
LSegre@ntia.gov

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.

This document contains software developed by NTIA. NTIA does not make any warranty of any kind, express, implied or statutory, including, without limitation, the implied warranty of merchantability, fitness for a particular purpose, non-infringement and data accuracy. NTIA does not warrant or make any representations regarding the use of the software or the results thereof, including but not limited to the correctness, accuracy, reliability or usefulness of the software or the results. You can use, copy, modify, and redistribute the NTIA-developed software upon your acceptance of these terms and conditions and upon your express agreement to provide appropriate acknowledgments of NTIA's ownership of and development of the software by keeping this exact text present in any copied or derivative works.

Back to Search Results