Implementing an analytical formula for calculating M(3000)F2 in the ionosonde operated in Havana

Determining the factor M(3000)F2 is very important for ionograms analysis obtained of Ionosonde. M(3000)F2 is the result of the maximum usable frequency (MUF), for to 3000 km distance, divided by the critical frequency of the F2 layer (FoF2). Nowadays, the graphic method to determine the M(3000)F2 is used in Havana station in the ionograms analysis. The purpose of this work is to implement an analytic method that allows us the direct obtaining of M(3000)F2, so it could be programmed and incorporated as part of ionograms elaboration process in Havana station. When is used a PC, some points in the ionogram can be determined. This dataset (f; h') are used to calculate analytically the factor M(3000)F2 . Comparison between the analytic method implemented and the old graphic method are shown. The new method is more accurate and the errors are diminished in the factor M(3000)F2.