| Summary: | The ionosphere is the part of Earth's upper atmosphere, from about 60 km to 1,000 km altitude and contains ionized particles and plasma. In this region at about 150 kilometers above the surface of the earth starts the F region and it extends up to 500 kilometers. The Ionosphere is filled with tenuous gases and is a mixture of neutral and charged particles. These winds do not follow any flow pattern and changes with season, the day's heating and cooling, and incoming bursts of radiation from the sun. In order to study the behavior of these ions and understand this complicated region, NASA has developed the ICON mission. The satellite consists of four major instruments which are IVM, EUV, FUV and MIGHTI. This work is concentrated on the EUV instrument which measures the ionized oxygen densities in the F region of the Ionosphere. Different atmospheric model including the IRI and TIEGCM, along with data obtained from ground-based observations and the ICON FUV instrument will be compared to the ionized oxygen profile, NmF2, HmF2 and various other parameters that are obtained from the EUV. The tool developed for ICON EUV instrument is tested using SSULI data and it agrees with the IRI and TIEGCM model. === Master of Science === The ionosphere is the part of Earth's upper atmosphere, from about 60 km to 1,000 km altitude and contains ionized particles and plasma. In this region at about 150 kilometers above the surface of the earth starts the F region and it extends up to 500 kilometers. The Ionosphere is filled with tenuous gases and is a mixture of neutral and charged particles. In order to study the behavior of these ions and understand this complicated region, NASA has developed the ICON mission. This work is concentrated on retrieving the data from EUV (Extreme Ultra Violet) instrument and compares the data with previously obtained data to check how consistent it is.
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