Abstract
Electron density profile data obtained from the Digisonde observations at Wuchang (30.5°N, 114.4°E) are used to study the IRI bottomside model, the electron density at a height of 170 km and other quantities descriptive of F 1-region ionization. Empirical formulas of the above parameters for Wuchang are proposed as functions of day number of the year d and the 12-month-running-mean sunspot number R 12 .
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