The structure of electromagnetic wave-induced 557.7-nm emission associatedwith a sporadic-E event over arecibo

We report observations of electromagnetic wave-induced 557.7-nm emission in correspondence with a sporadic low altitude plasma layer (the sporadic-E l ayer, E-s). We show that the structure of 557.7-nm emission seen for some e vents results from a transformation of transmitted energy by ionization clo uds, compiling the patchy type E-s, and presents a projection of the sporad ic-E layer structure on the emission altitude. This allows us to propose th e first method for visualizing a horizontal structure of sporadic-E layers.