Using High Frequency Propagation to Calculate Basic Maximum Usable Frequency

A comparison between observed (obs.) digital ionospheric sounding data and predicted (pre.) using International Reference Ionosphere (IRI) model for critical frequency (foF2) and Basic Maximum Usable Frequency (BMUF) of ionospheric F2-Layer has been made. A mid-latitude region selected for this research work by using data from station Wakkanai ($45.38^{o} N$, $141.66^{o} E$). This study included 12 monthly median data from year (2001, $R_{12}=111$) selected for high Sunspot number (SSN) and years for low SSN (2004, $R_{12}=44$) and (2005, $R_{12}=29$). Frequency parameters foF2 reveals that there is a good correlation between observed and predicted except for January of years 2001 and 2004, and BMUF revealed that there is a good correlation between observed and predicted for years of low SSN and all months except in month 1, 9 and 12 of year 2004, for year 2001 of high SSN there is a bad correlation. A correction factor as a function of time used from fitting technique to correct the predicted value with observed value of BMUF for year 2001.