Relationship between power line radiation and VLF wave activities observed in Iceland

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Following our previous study on the dependence of VLF emission activity at Syowa Station in Antarctica upon the day of the week, we extended this study with the VLF data in Iceland. All of the data at 0.75,1.2 and 2.0kHz observed at Husafell, Isafjordur, and Tjornes from September 1984 to May 1985 showed no significant weekday dependence of the VLF emission activities, similarly to the data of Syowa Station, except for Tjornes data at 1.2kHz with a strong artificial noise on weekdays but not in the weekend. This effect is clearly found statistically as the weekend decrease of VLF signal intensity at 1.2kHz. It may be due to a power line radiation from the source region which is earlier pointed out by C. G. PARK and T. R. MILLER (J. Geophys. Res., 84,943,1979) using the Siple data. It was also found in Iceland and Syowa data that VLF riser emissions are supposed to be triggered by power line harmonic radiations. It may be suggested that power line harmonic radiation can trigger VLF emissions in the Iceland-Syowa meridian, although no significant weekend decrease of VLF emission activity have been yet statistically detected at these stations.
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