GOMOS is a medium resolution spectrometer covering the wavelength range from 250 nm to 950 nm. The high sensitivity requirement down to 250 nm has been a significant design driver leading to an all-reflective optical system design for the UVVIS part of the spectrum and to functional pupil separation between the UVVIS and the NIR spectral regions (thus no dichroic separation of UV). Due to the requirement of operating on very faint stars (down to magnitude 4 to 5), the sensitivity requirement to the instrument is very high. Consequently, a large telescope (30 cm × 20 cm aperture) had to be used to collect sufficient signal, and detectors with high quantum efficiency and very low noise had to be developed to achieve the required signal to noise ratios.
Relative spectral accuracy: 0.17 / 0.20 nm in UVVIS (dark / brightlimb typical)
Spectrometers: UV-Vis: 248-371nm & 387-693nm,NIR:750-776nm& 915-956nm,Photometers: 644-705nm & 466-528nm
Atmosphere ( Chemistry , Ozone )
Latest Mission Operations News
27 May 2016
ESA will shortly introduce an important change for users in the way to obtain Envisat and ERS (A)SAR data. Evolving from the traditional on-demand PAC production to the new On-The-Fly data processing will imply significant improvement for users being able to trigger (A)SAR processing and download directly from the ESA archive via the new (A)SAR data On-The-Fly (OTF) service.
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