THE CORRECTION TECHNIQUE FOR IRI MODEL ON THE BASIS OF OBLIQUE SOUNDING DATA AND SIMULATION OF IONOSPHERE DISTURBANCE PARAMETERS

New way of IRI model adaptation to ionosphere conditions on the basis of oblique sounding (OS) experimental data obtained by chirp-sounder was used. This correcting technique can be applied to other f0F2-adaptable models of the ionosphere. The IRI adaptation was made by means F2-layer critical frequency correction at middle point of the path. Value of the critical frequency was got from the distance-frequency characteristic (DFC) by converting “last point ” of upper ray by means improved Smith’s method. The some anomalous OS ionograms, which were registered in experi-ments during March 2004 on Magadan—Irkutsk and Khabarovsk—Irkutsk paths, are shown. The technique for model-ing of oblique sounding anomalous DFC on the basis of joint using of OS and vertical sounding experimental data, IRI model and method of characteristics are presented. The results are of interest for problems of OS-data based operational diagnosis and prediction, particularly vital for areas where vertical sounding data are lacking or unavailable