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Creation of visible artificial optical emissions in the aurora by high-power radio waves

Nature volume 433, pages 498–500 (2005)Cite this article

Abstract

Generation of artificial light in the sky by means of high-power radio waves interacting with the ionospheric plasma has been envisaged since the early days of radio exploration of the upper atmosphere, with proposed applications ranging from regional night-time street lighting to atmospheric measurements1. Weak optical emissions have been produced for decades in such ionospheric ‘heating’ experiments, where they serve as key indicators of electron acceleration, thermal heating, and other effects of incompletely understood wave–particle interactions in the plasma under conditions difficult to replicate in the laboratory2. The extremely low intensities produced previously have, however, required sensitive instrumentation for detection, preventing applications beyond scientific research. Here we report observations of radio-induced optical emissions bright enough to be seen by the naked eye, and produced not in the quiet mid-latitude ionosphere, but in the midst of a pulsating natural aurora. This may open the door to visual applications of ionospheric heating technology or provide a way to probe the dynamics of the natural aurora and magnetosphere.

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Figure 1: A pair of all-sky images taken 5 s apart showing the dynamic natural background aurora pulsating in long bands over most of the sky.
Figure 2: Images from the HAARP telescope wide field camera showing speckle-like artificial optical emissions superimposed on the background aurora only during frames when the transmitter was on.
Figure 3: Calibrated measurements from the HAARP imager showing the intensities of various auroral emissions including the oxygen green line, which was well above the threshold for detection by the naked eye during the experiment.

References

  1. Bailey, V. A. On some effects caused in the ionosphere by electric waves, Part II. Phil. Mag. 26(7), 425–453 (1938)

    Article  Google Scholar 

  2. Bernhardt, P., Duncan, L. M. & Tepley, C. A. Artificial airglow excited by high-power radio waves. Science 242, 1022–1027 (1988)

    ADS  CAS  Article  Google Scholar 

  3. Chamberlain, J. W. Physics of the Aurora and Airglow (International Geophysics Series Vol. 2, Academic, New York, 1961)

    Google Scholar 

  4. Rishbeth, H. & Garriot, O. K Introduction to Ionospheric Physics (Academic, New York, 1969)

    Google Scholar 

  5. Djuth, F. T. et al. Large airglow enhancements produced via wave-plasma interactions in sporadic E. Geophys. Res. Lett. 26, 1557–1560 (1999)

    ADS  Article  Google Scholar 

  6. Omholt, A. The Optical Aurora 6 (Physics and Chemistry in Space Vol. 4, Springer, New York, 1971)

    Book  Google Scholar 

  7. Sergienko, T., Kornilov, I., Belova, E., Turunen, T. & Manninen, J. Optical effects in the aurora caused by ionospheric HF heating. J. Atmos. Sol-Terr. Phys. 59, 2401–2407 (1997)

    ADS  Article  Google Scholar 

  8. Blagoveshchenskaya, N. F. et al. Ionospheric HF pump wave triggering of local auroral activation. J. Geophys. Res. 106, 29071–29089 (2001)

    ADS  Article  Google Scholar 

  9. Bauer, S. J. Physics of Planetary Ionospheres 82–95 (Physics and Chemistry in Space Vol. 6, Springer, New York, 1973)

    Google Scholar 

  10. Davis, N. The Aurora Watchers Handbook 58 (Univ. Alaska Press, Fairbanks, 1992)

    Google Scholar 

  11. Carlson, H. C. Jr & Egeland, A. in Introduction to Space Physics (eds Kivelson, M. G. & Russell, V.) 459–502 (Cambridge Press, New York, 1995)

    Google Scholar 

Download references

Acknowledgements

HAARP is a Department of Defense programme operated jointly by the US Air Force and US Navy. We thank E. Mishin for his contributions to the experiment planning and P. Ning for operating the all-sky imager.

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Authors and Affiliations

  1. Space Vehicles Directorate, Air Force Research Laboratory, Hanscom Air Force Base, Massachusetts, 01731, USA

    Todd. R. Pedersen

  2. Department of Electrical and Computer Engineering, Cornell University, New York, 14853, Ithaca, USA

    Elizabeth A. Gerken

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  1. Todd. R. Pedersen
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  2. Elizabeth A. Gerken
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Correspondence to Todd. R. Pedersen.

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Pedersen, T., Gerken, E. Creation of visible artificial optical emissions in the aurora by high-power radio waves. Nature 433, 498–500 (2005). https://doi.org/10.1038/nature03243

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