Figures and Tables

From the following article:

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

Todd. R. Pedersen and Elizabeth A. Gerken

Nature 433, 498-500(3 February 2005)

doi:10.1038/nature03243

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Figure 1 - Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact npg@nature.com

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.

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Figure 2 - Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact npg@nature.com

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.

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Figure 3 - Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact npg@nature.com

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.

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