Open AccessA power line as a tunable ULF‐wave radiator: Properties of artificial signal at distances of 200 to 1000 km
Author(s) -
Ermakova E. N.,
Kotik D. S.,
Polyakov S. V.,
Bösinger T.,
Sobchakov L. A.
Publication year - 2006
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2005ja011420
Subject(s) - ionosphere , magnetometer , amplitude , radiator (engine cooling) , physics , geophysics , line of sight , signal (programming language) , computational physics , line (geometry) , polarization (electrochemistry) , ultra low frequency , geology , optics , acoustics , astrophysics , magnetic field , geometry , chemistry , mathematics , quantum mechanics , computer science , programming language
A power line of 108 km length in the Kola Peninsula, Russia, was fed by a tunable AC current in the upper ULF and lower ELF frequency band. Its magnetic signature was received by the Finnish chain of pulsation magnetometers at distances from 200 to 1000 km from the source. Amplitudes and polarization properties were analyzed as a function of frequency, distance, line‐of‐sight angle, and local time. Some evidence was obtained that, beside the geological structure underneath the radiator, also different ionospheric conditions affect the received signal properties in a systematic way. The efficiency of the power line as an ULF‐wave radiator proved to exceed largely those typically obtained in similar experiments based on modulation of ionospheric currents by powerful HF heating.