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DEVELOPMENT OF 2.8-GHZ SOLAR FLUX RECEIVERS
윤영주,박용선,김창희,이방원,김정훈,유세호,이철환,한진욱,김영윤 한국천문학회 2014 Journal of The Korean Astronomical Society Vol.47 No.6
We report the development of solar flux receivers operating at 2.8 GHz to monitor solar radio activity. Radio waves from the sun are amplified, filtered, and then transmitted to a power meter sensor without frequency down-conversion. To measure solar flux, a calibration scheme is designed with a noise source, an ambient load, and a hot load at 100$\;^{\circ}$C. The receiver is attached to a 1.8 m parabolic antenna in Icheon, owned by National Radio Research Agency, and observation is being conducted during day time on a daily basis. We compare the solar fluxes measured for last seven months with solar fluxes obtained by DRAO in Penticton, Canada, and by the Hiraiso solar observatory in Japan, and finally establish equations to convert observed flux to the so-called Penticton flux with an accuracy better than 3.2 sfu.