Title of article :
SOL–ACES: Auto-calibrating EUV/UV spectrometers for measurements onboard the International Space Station Original Research Article
Author/Authors :
G. Schmidtke، نويسنده , , R. Brunner، نويسنده , , D. Eberhard، نويسنده , , B. Halford، نويسنده , , U. Klocke، نويسنده , , M. Knothe Tate، نويسنده , , W. Konz، نويسنده , , W.-J. Riedel، نويسنده , , H. Wolf، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2006
Pages :
10
From page :
273
To page :
282
Abstract :
The SOL–ACES experiment is prepared to be flown with the ESA SOLAR payload to the International Space Station as planned for the Shuttle mission E1 (Columbus) in August 2006. Four grazing incidence spectrometers of planar geometry cover the wavelength range from 16 to 220 nm with a spectral resolution from 0.5 to 2.3 nm. These high-efficiency spectrometers will be re-calibrated by two three-signal ionization chambers to be operated with 42 band pass filters on routine during the mission. Re-measuring the filter transmissions with the spectrometers also allows a very accurate determination of the changing second order (optical) efficiencies of the spectrometers as well as the stray light contributions to the spectral recording in different wavelength ranges. In this context the primary requirements for measurements of low radiometric uncertainty are discussed in detail. The absorbing gases in the ionization chambers are neon, xenon and a mixture of 10% nitric oxide and 90% xenon. The laboratory measurements confirm very high count rates such that optical attenuators have to be applied. In addition, possible interfering contributions to the recorded data as generated by secondary effects can be determined to a high degree of accuracy by this method. Hence, very accurate irradiance measurements are expected in terms of relative standard uncertainties (RSU) ranging from 5% to 3% depending on the wavelength range.
Keywords :
In-flight calibration of EUV spectrometers , Three-signal ionisation chamber
Journal title :
Advances in Space Research
Serial Year :
2006
Journal title :
Advances in Space Research
Record number :
1130671
Link To Document :
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