Abstract
Backscatter ionograms (BI) and quasi vertical incidence (QVI) ionograms are routinely collected at over‐the‐horizon radar (OTHR) installations operated by the U.S. Navy. The BI provides information about the downrange ionosphere up to several thousand km from the sounder. In this paper, a method for the quantitative extraction of this information by means of a leading edge inversion technique is described and applied to data acquired by the BI sounder operating at the Chesapeake, VA OTHR facility. Because this sounder is used to sample 8 azimuthal sectors, maps of plasma frequency at a constant altitude can be derived over a geographic region that covers a 64° angular sector out to distances of ∼2000 km. The unique capability of the OTHR BI sounders to provide realtime monitoring of the ionosphere over a large geographical area is demonstrated.
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