Abstract
Scaling of original ionograms obtained in the polar regions has lead to a classification scheme for spread- F ionograms. Defined are three types of frequency spreading (spreadish- F, furcated- F and spurred- F) and one type of range spreading. Each type is subdivided into species. An example is given for the occurrence of each type on a magnetically quiet day at six polar stations. It is found that spreadish- F predominates and is found more often during the daylight hours than at night. The second most frequent type is range spreading which shows up during the night hours.
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