Power line harmonic radiation in Newfoundland

Yearby, K. H.; Smith, A. J.; Kaiser, Thomas; Bullough, K.

doi:10.1016/s0021-9169(83)81100-3

Cited by 28 publications

(20 citation statements)

References 16 publications

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“…This power line model was verified experimentally by Yearby et al (1983) using ground-based measurements of PLHR. Using the same approach as Park and Dejnakarintra (1973), a theory was carried out by Molchanov et al (1991) to explain the weekly variation of data around 72 Hz recorded by a low altitude satellite .…”

Section: The Emissions From the Earthmentioning

confidence: 87%

Physical mechanisms of man-made influences on the magnetosphere

Parrot

Zaslavski

1996

Surv Geophys

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Since the discovery of the Luxembourg effect in the 1930s, it is clear that man-made activities can perturb the ionosphere and the magnetosphere. The anthropogenic effects are mainly clue to different kinds of waves coming from the Earth's surface. Acoustic-gravity waves are generated by large explosions, spacecraft launches, or flight of supersonic planes. Electromagnetic waves are active in different frequency ranges. Power line harmonic radiation which is radiated in the ELF range by electrical power systems can be observed over industrial areas. At VLF and HF, the ground-based transmitters used for communications or radio-navigation heat the ionosphere and change the natural parameters. A large variety of phenomena is observed: wave-particle interaction, precipitation of radiation belt electrons, parametric coupling of EM whistler waves, triggered emissions, frequency shift, and whistler spectrum broadening. This paper will review the different physical mechanisms which are relevant to such perturbations. The possibility of direct chemical pollution in the ionosphere due to gas releases is also discussed.

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Section: The Emissions From the Earthmentioning

confidence: 87%

Physical mechanisms of man-made influences on the magnetosphere

Parrot

Zaslavski

1996

Surv Geophys

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“…The Siple VLF transmitter has been used to simulate PLHR effects in the magnetosphere, transmitting a radiated power of •-0.5 W [Park and Chang, 1978]. In contrast, estimates of the radiated power from several power lines in the Halley conjugate region were found to be less than 1/tW per harmonic [Yearby et al, 1983]. Thus, at that time, PLHR sources appeared to be too weak by a factor of--,105 to cause directly observable effects.…”

Section: Spacing Of Mlrmentioning

confidence: 99%

Is magnetospheric line radiation man‐made?

Rodger¹,

Clilverd²,

Yearby³

et al. 2000

J. Geophys. Res.

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(4) there is no evidence of a Sunday, weekend, or other 7-day cycle in the occurrence of MLR. Taken together these results strongly suggest that MLR is a natural VLF emission and is not primarily caused by PLHR. In addition, Halley data have been examined to determine whether the intensity of all types of VLF emissions are influenced by PLHR. We find that (1) there is no significant difference between weekdays and weekends over the frequency range 0.5-9.3 kHz and (2) there is no consistent change in wave intensity that is observed around any of the major North American holiday periods. It is concluded that PLHR is not a significant influence on geospace as viewed from Halley.

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“…Some interesting measurements have been made in Newfoundland by Yearby et al (1983). These authors measured the VLF wave amplitude spectra at varying distances from power lines and deduced the unbalanced currents in the lines ($mA).…”

Section: Observational History Of Plhrmentioning

confidence: 99%

On the nonlinear triggering of VLF emissions by power line harmonic radiation

Nunn¹,

Manninen²,

Turunen³

et al. 1999

Ann. Geophys.

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Abstract. VLF ground data from Porojarvi in N. Finland has been presented. Spectrograms reveal frequent occurrence of power line harmonic radiation (PLHR), originating from the Finnish power system and from heavy industrial plant. The radiation is seen to penetrate the magnetosphere since numerous occurrences of PLHR triggered emissions are seen. Risers predominate but fallers and hooks are also observed. A well-established 1D Vlasov simulation code has been used to simulate these emissions, using plausible magnetospheric data for a range of L values from L = 4 to L = 5.5. The code is able to reproduce risers fallers and hooks in close agreement with observations. The results shed considerable insight into the generation structure of both risers and fallers.

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Power line harmonic radiation in Newfoundland

Cited by 28 publications

References 16 publications

Physical mechanisms of man-made influences on the magnetosphere

Physical mechanisms of man-made influences on the magnetosphere

Is magnetospheric line radiation man‐made?

On the nonlinear triggering of VLF emissions by power line harmonic radiation

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