Observations of intensity variations and harmonics of heater induced VLF waves

Details Observations of intensity variations and harmonics of heater induced VLF waves Observations of intensity variations and harmonics of heater induced VLF waves

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.2351o&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, v. 59, p. 2351-2360.

Physics

2

Scientific paper

Very low-frequency (VLF) radio waves have been generated in the ionosphere by the heating facility near Tromsø. VLF signals have been received at Porojärvi (69.17° N, 21.47° E, L=6.1), in Northern Finland, about 100 km from the heating transmitter. Three heating experiments were performed under different geophysical conditions and different results were obtained. Signal intensities have been compared with magnetic variations. Correlations and anti-correlations were observed. Several harmonics of the generated signal have generally been found. In some cases when the intensity of the detected VLF signal was low the first harmonic was as intensive as the fundamental frequency. VLF response from Artificial Periodic Inhomogeneities (API) experiment was also observed.

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