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13 October 2008 The solar EUV instrumentation onboard the Earth geostationary orbit satellite
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Solar Extreme Ultravoilet (EUV) irradiance is one of the most important energy input source for the upper atmosphere. It's responsible for the variation of the composition of upper atmosphere, vertical profile of the atmosphere density and ionosphere's TEC. In order to investigate the solar EUV irradiance in different time scales, it's better to launch EUV grating spectrograph covering the whole solar EUV spectrum. Because of the high contrast between the solar EUV emission lines, it is possible to characterize the whole solar EUV spectrum by monitoring individual bright EUV emission lines, such as the Lyman alpha emission line (121.6nm in wavelength) and the He-II emission line (30.4nm in wavelength). The solar EUV instruments described in this paper are broad wavelength passband EUV monitors respectively covering the emission lines of 30.4nm and 121.6nm. Additional important emission lines are optional, such as 12.1nm, 58.4nm and 85.6nm. Each instrument covers just one emission line selected by a group of optic components - a multi-metal-film filter selecting the EUV wavelength passband and a spherical multilayer-coated reflecting mirror collecting the solar EUV irradiance from different incidence angle and improving the wavelength resolution. This kind of design will be used in the case high accuracy solar pointing system is unavailable, and the strong background of energetic charged particles is serious, such in the earth geostationary orbit, which is located in the limb of outer radiation belt.
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Fei Wei, Guangwu Zhu, Jilong Peng, Shijin Wang, and Huaan Lin "The solar EUV instrumentation onboard the Earth geostationary orbit satellite", Proc. SPIE 7128, Seventh International Symposium on Instrumentation and Control Technology: Measurement Theory and Systems and Aeronautical Equipment, 71282P (13 October 2008);

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