Accession Number : AD0779845
Title : ELF Field Strength Measurements Made in Connecticut from September 1973 through January 1974.
Descriptive Note : Technical rept.,
Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CONN NEW LONDON LAB
Personal Author(s) : Bannister,Peter R. ; Williams,Frederick J.
Report Date : 06 MAY 1974
Pagination or Media Count : 43
Abstract : Horizontal magnetic field strength measurements at 42 and 76 Hz were made in Connecticut on a one-week-per-month basis, beginning in September 1973 and extending through January 1974. These measurements are for the purpose of further investigating sunset, nighttime, and seasonal ELF propagation variations. Integration times of 10 to 15 minutes per sample were employed for the majority of the measurements. The transmission source for these 1.6-Mm measurements was the U.S. Navy ELF Wisconsin Test Facility. The principal results obtained from these measurements were: (1) ELF nighttime propagation is much more variable than daytime propagation, and (2) there may be at least 50 nights each year when the average nighttime field strength will be approximately 3 dB lower than on the preceding or following nights. (Author)
Descriptors : *Radio transmission, Extremely low frequency, Field intensity, Far field, Measurement, Connecticut, Superlow frequency, Periodic variations, Seasonal variations, Diurnal variations
Subject Categories : Radiofrequency Wave Propagation
Distribution Statement : APPROVED FOR PUBLIC RELEASE