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18 August 2005 Modification of the special sensor ultraviolet limb imagers
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The first of five Special Sensor Ultraviolet Limb Imager (SSULI) sensors was launched on the Defense Meteorological Satellite Program (DMSP) F16 spacecraft in October of 2003 into a sun-synchronous 830 km circular orbit at a local time of 0800-2000 UT. During initial sensor turn-on and evaluation, unusually high levels of background events were observed by the detector. The severity of this background is often sufficient to exceed the counting limit of the electronics as well as contribute to a rapid decrease in detector performance. In light of the SSULI performance degradation and concerns that the subsequent sensors may be affected in a similar manner, a "Tiger Team" investigation was launched to determine the source of the anomalous events. The conclusion from the investigation attributes the observed anomalous events to high levels of non-photon noise caused by ambient ions entering the instrument and striking the front microchannel plate. Additionally, the team made recommendations to mitigate the problem on future flights.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. C. Nicholas, S. E. Thonnard, P. C. Kalmanson, K. M. Weldy, T. Duffey, P. Jaffe, S. P. Lynch, P. Walker, K. Dymond, and S. Budzien "Modification of the special sensor ultraviolet limb imagers", Proc. SPIE 5901, Solar Physics and Space Weather Instrumentation, 59010J (18 August 2005);


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