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An exte nsion of Budden's matrix m ethod for determining io nospheri c layer profil es is described. When a nalyzin g ver tical i ncid ence ionogram s by the mat ri x method, it is usual to in te rpret t he vir t ual heigh t curve for t he ordi nary mode only . E rrors t he n a ri se from t he presence in t he lower ionosphere of low-densi ty ionizatio n for whi ch t he p lasm <t freq uency is less t han t he lowest frequency observed. In t he proposed extension of t he m et hod, sll ch errors are r edu ced by making use of the extrao rdin ary vir t ual heig ht cur ve as well as of the ordinary.

The joint use of the ordinary and extraordinary virtual height curves in determining ionos[)heric layer jirofiles