A large collection of experimental D-region electron density profiles has been searched to find those profiles obtained under disturbed conditions, such as eclipses and solar flares. Where possible, each disturbed profile has been associated with a suitable reference profile corresponding to the undisturbed ionosphere, in order to determine the effect of the particular kind of disturbance. A model electron density profile corresponding to the undisturbed ionosphere has also been calculated in each case, and may be used as a reference profile when no suitable experimental profile is available. All profiles have been plotted in a self-evident format which made it easy to see the effect of the disturbance considered.

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