Abstract
On the nonlinear triggering of VLF emissions by power line harmonic radiation
Highlights
Power line harmonic radiation (PLHR) is a fascinating geophysical phenomenon in the near space environment that has excited much interest and lively debate during the past 20 years
It was in 1975 that Stanford University workers (Helliwell et al, 1975) positively identi®ed PLHR lines and postulated that they originated from radiation from terrestrial power line systems
At the present time the general scienti®c consensus is that magnetospheric lines have their initiating source in terrestrial power line systems and/or heavy industrial plant
Summary
Power line harmonic radiation (PLHR) is a fascinating geophysical phenomenon in the near space environment that has excited much interest and lively debate during the past 20 years. In this study we shall present some speci®c examples of magnetospheric VLF emissions triggered by PLHR. These have been observed on the ground at PorojaÈ rvi in Finland at an L shell of L = 6.1. We shall utilise a well-established 1D Vlasov VHS code to numerically simulate the main types of triggered emission observed, in order to understand the linear and nonlinear processes by which PLHR interacts with the ambient plasma. D. Nunn et al.: On the nonlinear triggering of VLF emissions by power line harmonic radiation
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