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Intensity pattern of the beam generated by the High Frequency Active Auroral Research Program near Gakona, Alaska. The central minimum is due to the phase ambiguity in the heart of the field, while the peaks surrounding the minimum arise from the rectangular shape of the antenna array. [T. B. Leyser, L. Norin, M. McCarrick, T. R. Pedersen, and B. Gustavsson, Phys. Rev. Lett. 102, 065004 (2009)] |
