Abstract
Solar EUV irradiance plays a fundamental role in shaping the structure of the thermosphere and the ionosphere. Radiometric observations in this spectral domain are lacking since 1980. New models have been developed based upon the Solar Mesosphere Explorer (SME) Lyman alpha measurements during the declining phase of cycle 21 and the rising phase of the current cycle. This paper will review the recent results obtained in EUV irradiance studies, including solar EUV modeling, for wavelengths from the FUV H Lyman-alpha line at 121.6nm down to the X-rays.
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