The relations between electron content, scintillation, and radio absorption are studied at an auroral zone station. It is found that during absorption events, indicating particle precipitation, the level of scintillation increases and the electron content increases in winter but is unchanged or slightly decreased in summer. At a given level of scintillation, the absorption is greater on a winter day than on a summer day. Although some of the observations are consistent with the results of other investigations, full explanations are lacking. It seems clear that, in addition to direct ionization production by auroral particles, other mechanisms must be involved. Further studies based on reception of geostationary satellite transmissions are recommended.
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