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Instrument: HESSI IMAGER |
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Associated Platforms RHESSI Spectral/Frequency Information Wavelength Keyword: X-Ray Number Channels: 1 Related Data Sets View all records related to this instrument Description The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) Imager consists of the Imaging Telescope Assembly, which consists of the telescope tube, grid trays, Solar Aspect System (SAS), and Roll Angle System (RAS). It was constructed, assembled, aligned, and tested at the Paul Scherrer Institut in Switzerland. The front and rear grid trays are attached to the telescope tube (shown here). It maintains the separation and alignment of the trays. Nine grids are mounted on a grid tray at each end of the telescope tube. The grid pairs modulate the transmission of solar flare x-ray and gamma-ray emissions through to the detectors as the spacecraft spins around the axis of the telescope tube. The modulated count rates in the nine detectors are used in computers on the ground to construct images of solar flares in different energy bands. The five coarse grids (square) were constructed by Van Beek Consultancy in The Netherlands. The four fine grids (round) were constructed by Thermo Electron Tecomet in Massachusetts. All grids were characterized both optically and with X-rays at Goddard before being shipped to the Paul Sherrer Institut for integration into the imaging telescope assembly. For more information, see: http://hesperia.gsfc.nasa.gov/hessi/instrumentation.htm Online Resources http://hesperia.gsfc.nasa.gov/hessi/instrumentation.htm Instrument Logistics Instrument Start Date: 2002-02-05 Instrument Owner: NASA/GSFC |
