With a surface temperature of approximately 6000˚C, the Sun emits its energy throughout the entire electromagnetic spectrum. Measuring the absolute value of energy emitted from the Sun at the correct chosen observation wavelength is significantly important to quantitatively predict the Sun's influence on space weather conditions and on the Earth.
One of the representative wavelengths on which to observe the absolute solar flux in the radio waveband is at a frequency of 2.8GHz. The Solar Flux 2.8GHz Monitor was installed at Icheon station in 2008 and has been in operation since then. Monitors using the same wavelength range also have been operated in countries such as Canada, Japan and the United States.
In order to receive the absolute solar flux within the radio waveband, each wavelength requires its own receiver. Moreover, maintaining the accuracy of the absolute solar flux values demands considerable effort. Accordingly, selecting the correct wavelength is greatly important. Taking into account the continuous growth in use of various broadcasting and communications devices, and the resulting increase in demand for usable frequency range, it is now necessary that in order to accurately observe the absolute solar flux, a 'new' radio waveband must be employed despite the fact that the 2.8GHz frequency is currently used globally for space weather prediction.