Abstract
In this work, the relationship between the ionospheric parameters (Maximum Usable Frequency (MUF), Lowest Usable Frequency (LUF) and Optimum working Frequency (OWF)) has been studied for the ionosphere layer over the Iraqi zone. The capital Baghdad (44.42oE, 33.32oN) has been selected to represent the transmitter station and many other cities that spread over Iraqi region have represented as receiver stations. The REC533 communication model considered as one of the modern radio broadcasting version of ITU has been used to calculate the LUF parameter, while the MUF and OWF ionospheric parameters have been generated using ASAPS international communication model which represents one of the most advanced and accurate HF sky wave propagation models. The study has been conducted for the annual and seasonal time periods of the years (2009 and 2014) of the solar cycle 24. The results of the seasonal and annual tests have indicated that the interrelationship between the MUF and OWF with LUF was a fourth order polynomial equation, while the reciprocal relationship between the MUF and OWF was a simple relationship that could be represented by a linear regression equation. The reciprocal relationships between MUF, LUF and OWF parameters (present values) have shown a good fitting with the data generated using the international models (predicted values) and theoretical values calculated from the criterion equation.
Highlights
The ionosphere is one of the Earth's atmosphere regions, which is expanded from about 60 to 1000 km
Research, the correlation relationship between (MUF), (OWF) and (LUF) parameters has been studied for solar cycle 24 over Iraqi region
The data of the Optimum Workable Frequency (OWF) and Maximum Usable Frequency (MUF) parameters have been calculated for the years 2009 and 2014 using the suggested reciprocal correlation equations based on the correlation coefficients that have been shown in Table (4)
Summary
The ionosphere is one of the Earth's atmosphere regions, which is expanded from about 60 to 1000 km. The Maximum Usable Frequency (MUF), Optimum Workable Frequency (OWF) and Lowest Usable Frequency (LUF) are the ionospheric parameters; these parameters describe the acceptable operation frequencies of a radio service between given terminals These parameters are affected by the primary factors influence (electron density of ionization), so these parameters will increase with higher ionization density and decrease with lower ionization density (3). The aim of this research is to study the behavior and correlation between the ionospheric parameters, Maximum Usable Frequency (MUF), Lowest Usable Frequency (LUF) and Optimum Working Frequency (OWF) for the communication links between transmitting and receiving stations over Iraqi Region. The ASAPS international model that is considered as one of the most advanced and accurate HF sky wave propagation model has been adopted to determine the values of the MUF and OWF parameters, and the REC533 propagation prediction model could assess the reliability and compatibility between frequencies (3 - 30 MHz). The monthly sunspot numbers for the selected years are shown in Table 1 (11):
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