Ionospheric Models Proceedings of the Topical Meeting of the Cospar Interdisciplinary Scientific Commission C (Meeting C6) and Symposium B4 of the Cospar Twenty-Ninth Plenary Meeting Held in Washington, DC, USA 28 August-5 September, 1992 - Advances in Space Research S.

The majority of this volume is devoted to Chapter 1 which is entitled "Verification and New Development of International Reference Ionosphere" covering the presentations both by invited and submitted papers. Together with the earlier volume, "Advances in Global/Regional Descriptions of Ionospheric Parameters", it reports on the foremost research by the working group IRI during the 1990-92 period.;The papers which relate to particular problems complement specific publications where the basis and algorithms used to establish the computer code (at present IRI 90) are described. On the basis of the code, the monthly averages for the electron density, ionic and electron temperatures and ionic composition of the still and non-aurorale ionosphere can be established. Since the creation of the IRI, the constant improvement of the description, based on carefully selected observation has led to increasingly elaborate presentations. This entailed the common use of the present computerized form of IRI 90. The analysis of the physical meaning of the observations used, their selection and recording, their time space representation as well as the subsequent confrontation of the modelization with the observation continues but up-to-date material can be found in this volume.