The behavior of the ionosphere over Chatanika, Alaska, has been observed through seven 24‐hour incoherent scatter measurements made during July, August, and September 1971 and February 1972. The observed behavior is very complex as a result of the competing influence of solar extreme ultraviolet (EUV) flux and energetic particle precipitation. It has been possible, however, to separate the observational data into three categories: solar EUV, auroral oval, and magnetically disturbed periods. Within the category solar EUV the observed behavior relates quite well to the indices' solar zenith angle and 10.7‐cm solar flux. Within the category auroral oval the observed behavior is consistent with the local magnetic K index and statistical results of other workers. Both qualitative and quantitative relations between the various parameters are discussed.