Nighttime Variations of Extremely Low Frequency (ELF) Signal Strengths in Connecticut

Bannister, P.; Williams, Frederick J.; Katan, J. R.; Ingram, Raymond F.

doi:10.1109/tcom.1974.1092223

Cited by 11 publications

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“…On several occasions during the past decade, the 40-80 Hz ELF nighttime field strength measured at sites in the northeastern United States (i.e., Connecticut and Maryland) has displayed rapid decreases of from 4 to 8 dB in several hours [Bannister, 1974[Bannister, , 1975[Bannister, , 1979bBannister et al, 1974Bannister et al, , 1980Bannister and Williams, 1976;Davis, 1974Davis, , 1976. These severe nighttime disturbances sometimes occur during the several days following magnetic storms when similar but less pronounced behavior is found to coincide a Now occupying Applied Physics Chair, Naval Postgraduate School, Monterey, California 93940.…”

Section: Introductionmentioning

confidence: 99%

Localized ELF nocturnal propagation anomalies

Bannister¹

1982

Radio Science

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On numerous occasions during the last decade, extremely low frequency nighttime field strength measured at various sites in the northeastern United States has displayed rapid decreases of from 4 to 8 d B in several hours. In this article we present further examples of localized ELF nighttime field strength variations and show that these variations are not restricted to measurement locations in the northeastern United States. Particular attention will be focused on simultaneous Connecticut and North Atlantic area measurements where nighttime propagation anomalies occurred 2-4 hours apart. A candidate for the cause of these anomalies is a moving nocturnal sporadic E layer.

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