Results of foF2 Data Testing With the UNDIV Program

The prediction of critical frequency foF2 is of great importance in the area of short-wave telecommunication and ionospheric modelling. The test study of foF2 data should enable the validity of data used in PRIME map generating and testing to be checked. The preliminary results show that some data should not be used because they could affect the latest results of PRIME map generating, testing and improving.