Figure 1.0: HF wave generate artificial effects in the ionosphere. This activity is observed by the incoherent scatter radar (ISR) from Arecibo. The HF system and the ISR work in parallel. The Figure shows the volumetric characteristics of the artificial ionospheric effects and how the ISR samples that volume.

IMPORTANT: The Arecibo Observatory does not have an active HF call for proposals right now. However, if you are interested in know about the facility and a future possibility to perform experiments with us, please contact Eliana Nossa ( or Mike Sulzer (


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