Simplified empirical model of the auroral D region for the international reference ionosphere

The results published by the author earlier are developed to create an empirical model of the D region within the auroral oval using the rocket measurements of the electron concentrations at high-latitude rocket sites both in the Southern and Northern Hemispheres. To describe the magnetic disturbance degree the daily sum of the 3-h Kp indices is used. The input parameters for the model at each height are the solar zenith angle and the daily sum of Kp. The empirical formulae describing the [e] behavior are derived, approximations of the coefficients involved are obtained both in the analytical and digital form and the Fortran programs for electron concentration computation are written.