An on-line, computer processing system for reducing topside ionograms to electron density profiles is described. This operational system permits the operator to utilize all available redundant information for data selection, comparison, correction, and verification. When discrepancies occur, reinterpretation and recomputation may be iterated until a self-consistent result is obtained. Examples of this closed-loop processing technique, essential for the analysis of ionograms collected at high altitudes, are shown. Development of a more sophisticated, accurate, and rapid system also is outlined.
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