Incoherent scatter results are presented using compressed‐pulse techniques to study a sporadic‐E layer at Arecibo. Multiple Barker‐coded pulses were used to obtain the autocorrelation function of the Es layer. A 13‐bit code with a baud length of 4 μsec was employed, resulting in 600‐m height resolution. The observations are examined for the presence of Fe+ by least‐square fitting the measured autocorrelation functions to a library of theoretical ones. The analysis indicates that Fe+ dominates in the Es layer, usually providing about 70% of the ionization.
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