20 September 2007 Analyses of GOES-13 EUV 5-channel spectra
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Abstract
The first of the Geo-stationary Operational Environmental Satellites (GOES) -NO/P series, built by Boeing Satellite Systems was launched on May 24, 2006. The spacecraft, now on-orbit and referred as GOES-13, carries an Earth Imager, Sounder and a collection of space environment monitors (SEM) including, for the first time, a solar Extreme Ultraviolet (EUV) telescope. The five-channel EUV telescope measures the solar EUV energies in five wavelength bands from 5 nm to 135 nm. We analyze the data from the five EUV channels, collected by the Post Launch Telemetry (PLT) tests, and compare it to the predictions of precise optical models of the instrument, using two modeling software- ZEMAXI and FREDII . From our models we detected a misalignment between the SXI and the XRS/EUV bore-sights that were off by approximately 0.25 degree. The reference solar irradiation between 1-140 nm in our model was acquired from the TIMED data taken at the same time as the GOES data. When corrected by the appropriate calibration factors, all 5 channels agreed reasonably well with the TIMED data at zero degree angle of incidence. As expected, the instruments' responses changed by more than 5% as a function of azimuth angles away from the Sun center. These changes in irradiation values as a function of angle could be corrected to the values at normal incidence using photometrical accurate optical models of the EUV instrument.
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Soumyendu Guha, Andrew Jones, Steve Benner, "Analyses of GOES-13 EUV 5-channel spectra", Proc. SPIE 6689, Solar Physics and Space Weather Instrumentation II, 66890L (20 September 2007); doi: 10.1117/12.734084; https://doi.org/10.1117/12.734084
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