Solar X-ray Imager
Solar X-ray Imager is a full-disc X-ray telescope for the Sun. It was the first of its kind and allows the United States NOAA to help predict the weather.
The Solar X-ray Imager (SXI) aboard the GOES 12, GOES 13, GOES 14, and GOES 15 United States NOAA weather satellites is used for early detection of solar flares, coronal mass ejections(CME), and space phenomena that impact human spaceflight and military and commercial satellite communications. The Solar X-ray Imager was the first x-ray telescope to take a "full-disk" image of the Sun, providing forecasters with the ability to detect solar storms and real-time solar forecasting by the Space Weather Prediction Center.
The SXI aboard GOES 12 weather satellite is a Wolter Type I(Wolter telescope) grazing incidence X-ray telescope designed to record coronal x-ray images in continuous sequence at 1-minute intervals. The Solar X-ray Imager obtains images at multiple wavelengths on the electromagnetic spectrum from 6 to 60 angstrom units(Å). The imagery obtained by the XSI and XRS on GOES 12 allowed forecasters to see space phenomena such as coronal holes, whose geomagnetic storms impact power grid systems on earth as well as radio communications and satellite communications systems. 
Failure and Termination of the GOES 12 Instrument
The XSI and XRS sensors on GOES 12 failed due to a problem with the electrical system which controls the north-south motion functionality of the instruments on April 12, 2007. The SXI and XRS currently have the ability to capture and record images. Due to limited field of view of the x-ray instrumentation, the XSI and XRS and been permanently deactivated. 
- "GOES Solar X-ray Imager". NOAA/SWPC. Retrieved 2009-12-12.
- "ENVIRONMENTAL SATELLITE READIED TO DETECT SOLAR STORMS". NASA/NOAA. 2003-01-30. Retrieved 2009-12-12.
- "The GOES Solar X-ray Imager". NASA/Marshall Solar Physics. 2007-01-18. Retrieved 2009-12-12.
- "GOES SXI Operational Status (2007-08-24)". Space Weather Prediction Center(SWPC). 2007-08-24. Retrieved 2009-12-12.