Abstract
Nonlinear properties of the ionosphere can be used to produce electromagnetic waves of ultra-low frequencies (ULF, 0–300 Hz). This can be achieved either by modulating one strong high-frequency (HF, 3–30 MHz) wave or by beating two strong radio-waves with a frequency difference Δf which lies in the ULF band. I report here observations of such ULF signals in two experiments. In the first, four HF transmitters were split into two pairs and operated with a frequency separation Δf between each of the pairs. In the second experiment, all of the transmitters were operated at the same high frequency and were pulsed. The ULF signals at 3, 5 and 6.25 Hz and with intensities of ∼150–350 × 10−11 G Hz−1/2 were received on the island of Mona, which is ∼ 150 km west of the transmitting site.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Getmanster, G. G. et al. Izv. vuzov. Radiofizikad 26, 1017 (1977).
Stubbe, P. et al. J. atmos. ten. Phys. 44, 1025–1041 (1982).
Ferraro, A. J. et al. J. atmos. terr. Phys. 44, 1113 (1982).
Tsytovitch, V. N. Non-linear Effects in a Plasma (Plenum, New York, 1970).
Fejer, J. Rev. Geophys. Space Phys. 17, 135–153 (1979).
Lavergnat, J., Bauer, P., Delahaye, J. Y. & Ney, R. Geophys. Res. Lett. 4, 417 (1977).
Ganguly, S. & Gordon, W. E. Non-Linear Mixing Processes in the Ionosphere. Pap. presented at URSI General Conf. Florence(1984).
Papadopoulos, K., Ko, K. & Tripathi, V. Phys. Rev. Lett., 51, 463 (1983).
Papadopoulos, K. & Chang, C. L. Geophys. Res. Lett. (in the press).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ganguly, S. Experimental observation of ultra-low-frequency waves generated in the ionosphere. Nature 320, 511–513 (1986). https://doi.org/10.1038/320511b0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/320511b0
This article is cited by
-
Electron heating in rf capacitive discharges at atmospheric-to-subatmospheric pressures
Scientific Reports (2018)
-
Dependence of Characteristics of SURA Induced Artificial ULF/VLF Signals on Geomagnetic Activity
Earth, Moon, and Planets (2015)
-
Properties of the ULF/VLF Signals Generated by the Sura Facility in the Upper Ionosphere
Radiophysics and Quantum Electronics (2013)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.