A review of the mechanisms on SOHO/CDS after five years in orbit

Details A review of the mechanisms on SOHO/CDS after five years in orbit A review of the mechanisms on SOHO/CDS after five years in orbit

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.480..107s&link_type=abstract

In: Proceedings of the 9th European Space Mechanisms and Tribology Symposium, 19-21 September 2001, Liège, Belgium. Compiled by

Computer Science

Soho, Coronal Diagnostic Spectrometer

Scientific paper

Launched in 1995 the joint ESA/NASA mission SOHO, has been a hugely successful mission, providing solar scientists with unique data and increasing our understanding of the processes that drive our Star, the Sun. The Coronal Diagnostic Spectrometer (CDS) is one of several large remote sensing instruments providing spectroscopic data of the corona in the extreme ultraviolet wavelength range. This instrument carries six mechanisms, all of which are used on a regular basis. Two separate door mechanisms, a mirror scan mechanism, a slit change mechanism and two identical pointing actuators. All solar UV instruments are very sensitive to contamination, particularly deposition of outgassing products onto the optical surfaces. For this reason a very rigorous programme of selection and processing of material was carried out for all materials which were used in the spectrometer. This placed very severe restrictions on the mechanism design, selection of materials and choice of lubrication systems. The paper briefly describes these mechanisms, their requirements and lubrication systems, for this ultra clean instrument. Life test results are reviewed together with over five years of in orbit data, including the effects of the well-publicised loss and recovery of SOHO.

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