A New Generation Of Solar X-euv Radiation Detectors Developed

The composition, structure, and dynamics of the earth's upper atmosphere is primarily driven by the full-disk solar X ray and vacuum ultraviolet (X-EUV) flux incident on the top of the atmosphere in the wavelength shorter than 2000?. The solar X-EUV energy is highly variable relatived to the visible solar white light. The solar X-EUV irradiance with shorter wavelength deposits energy in the higher atmosphere and that with longer wavelength penetrats to lower altitudes. Comparing with other parts of solar X-EUV irradiance, the parts with wavelength of 304 ? and 1216 ? have a spectacularly interaction with the upper earth's atmosphere. The variability of the solar EUV irradiance in the wavelength of about 304 ? and 1216 ? is much greater than that of its total energy. The irradiance in about 304 ? wavelength has an energy variability in the range of tens of times, and that in about 1216 ? wavelength has its variability up to a factor of 2. The solar photons with wavelength of about 304 ? primarily deposits their energy in the altitude range of 150Km to 500Km, which has a special important influence to spacecrafts orbiting in this region. Lyman-αwith the wavelength of 1216? is the most intense emission line in the solar EUV. It can penetrate down to 70Km in altitude in the Earth's atmosphere and deposits its energy mainly by dissociating O2 and ionizing nitric oxide and dissociate water. It has a determining influence in this region of terrestrial upper atmosphere. Solar hydrogen Lyman-αemissions originate from a range of altitudes in the solar chromosphere and the transition region between the chromosphere and corona. Based on this reason, Tobiska etc. explored the energy of Lyman-αas an input parameter of their proxy of modeling the solar X-EUV correlations and subsequent versions of that model.Studies show that the solar X-EUV irradiance has high relativity with the happenness of solar proton events. The solar X-EUV irradiance monitoring is a high reliable and important way for forecasting space environment diaster such as high energy solar proton events.Spectrometers and solar EUV photometers are common instruments for measuring the solar X-EUV irradiance. Solar X-EUV photometers have good performance for measuring special wave bands of solar irradiance. Because all of the common materials have an extremely strong characteristics of absorbing the solar EUV irradiance, that makes it particularly difficult to manufacture good filters for selection of solar EUV irradiance for the photometers, especially for eliminating influence by soft solar X-ray and hard solar EUV (<200 ?). In this paper a new type of solar X-EUV spectrometer using silicon drift detector(SDD) for solar X ray measuring and a multi-layer metal film hyperboloid reflecting mirror system as a wavelength-selection filter for solar EUV measuring is discussed.