An investigat ion of the effects of the total solar eclipse of 20 July ]963 on th e highlatitude ionosphere was condu cted at v arious locations in Alaska. Simulta neous obse r vat ions of I-IF forwa rd propagn,t ion and ve rtical in cid ence sounder meas urements of var ious ionosph eric p a ra meters i ndica t ecl marked changes in E-a nd F I-la yer cri tical fr equenci es a nd virtual hpi ghts durin g t hc eclipse.
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R. D. Hunsucker (1965) studied this question.