Interpretation of electron concentration measurements using a semiempirical model
Analysis of the results of electron concentration (N) measurements using the semiempirical model describing the correlations of N with thermospheric characteristics and also with the integral energy flux of the ionizing radiation E is presented. This analysis allows a relative content of atomic oxygen to be estimated if we may assume that the E value is well described by means of the actual model of spectral distribution of the ionizing radiation energy. Alternatively, E which is necessary for making agreement between the observable and computed N can be estimated. Such estimates for measurements of N with a digital ionosonde were made at the Institute of Solar-Terrestrial Physics in 2003 and 2004. The estimates were made for medium conditions of the thermosphere-ionosphere system and for summer seasons.