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- a9c0abe0-204e-414a-89ba-dae7da179cbe definition "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 Group: Instrument_Details Entry_ID: HESSI IMAGER Group: Instrument_Identification Instrument_Category: Solar/Space Observing Instruments Instrument_Class: X-Ray/Gamma Ray Detectors Short_Name: HESSI IMAGER End_Group Group: Associated_Platforms Short_Name: RHESSI End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: X-Ray Number_Channels: 1 End_Group Online_Resource: http://hesperia.gsfc.nasa.gov/hessi/instrumentation.htm Sample_Image: http://hesperia.gsfc.nasa.gov/hessi/images/Grid_Tray_Front.jpg Group: Instrument_Logistics Instrument_Start_Date: 2002-02-05 Instrument_Owner: NASA/GSFC End_Group End_Group" @default.
- a9c0abe0-204e-414a-89ba-dae7da179cbe id "1655266" @default.
- a9c0abe0-204e-414a-89ba-dae7da179cbe path_id 02c354fd-8e2d-4825-b786-aa4b0782d1d6 @default.
- a9c0abe0-204e-414a-89ba-dae7da179cbe path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- a9c0abe0-204e-414a-89ba-dae7da179cbe path_id d49b2313-2fb1-464c-a2f8-5ff5799344a7 @default.
- a9c0abe0-204e-414a-89ba-dae7da179cbe path_label "Instruments" @default.
- a9c0abe0-204e-414a-89ba-dae7da179cbe path_label "Solar/Space Observing Instruments" @default.
- a9c0abe0-204e-414a-89ba-dae7da179cbe path_label "X-Ray/Gamma Ray Detectors" @default.
- a9c0abe0-204e-414a-89ba-dae7da179cbe prefLabel "HESSI IMAGER" @default.
- a9c0abe0-204e-414a-89ba-dae7da179cbe reference "" @default.
- a9c0abe0-204e-414a-89ba-dae7da179cbe tag "Instruments" @default.
%20Imager%20%0Aconsists%20of%20the%20Imaging%20Telescope%20Assembly%2C%20which%20consists%20of%20the%20telescope%0Atube%2C%20grid%20trays%2C%20Solar%20Aspect%20System%20(SAS)%2C%20and%20Roll%20Angle%20System%20(RAS).%20It%0Awas%20constructed%2C%20assembled%2C%20aligned%2C%20and%20tested%20at%20the%20Paul%20Scherrer%20Institut%0Ain%20Switzerland.%20The%20front%20and%20rear%20grid%20trays%20are%20attached%20to%20the%20telescope%0Atube%20(shown%20here).%20It%20maintains%20the%20separation%20and%20alignment%20of%20the%20trays.%20%0A%0ANine%20grids%20are%20mounted%20on%20a%20grid%20tray%20at%20each%20end%20of%20the%20telescope%20tube.%20The%0Agrid%20pairs%20modulate%20the%20transmission%20of%20solar%20flare%20x-ray%20and%20gamma-ray%0Aemissions%20through%20to%20the%20detectors%20as%20the%20spacecraft%20spins%20around%20the%20axis%20of%0Athe%20telescope%20tube.%20The%20modulated%20count%20rates%20in%20the%20nine%20detectors%20are%20used%20in%0Acomputers%20on%20the%20ground%20to%20construct%20images%20of%20solar%20flares%20in%20different%20energy%0Abands.%0A%0AThe%20five%20coarse%20grids%20(square)%20were%20constructed%20by%20Van%20Beek%20Consultancy%20in%20The%0ANetherlands.%20The%20four%20fine%20grids%20(round)%20were%20constructed%20by%20Thermo%20Electron%0ATecomet%20in%20Massachusetts.%20All%20grids%20were%20characterized%20both%20optically%20and%20with%0AX-rays%20at%20Goddard%20before%20being%20shipped%20to%20the%20Paul%20Sherrer%20Institut%20for%0Aintegration%20into%20the%20imaging%20telescope%20assembly.%20%0A%0AFor%20more%20information%2C%20see%3A%0Ahttp%3A%2F%2Fhesperia.gsfc.nasa.gov%2Fhessi%2Finstrumentation.htm%0A%0A%0AGroup%3A%20Instrument_Details%0A%20%20%20Entry_ID%3A%20HESSI%20IMAGER%0A%20%20%20Group%3A%20Instrument_Identification%0A%20%20%20%20%20%20Instrument_Category%3A%20Solar%2FSpace%20Observing%20Instruments%0A%20%20%20%20%20%20Instrument_Class%3A%20X-Ray%2FGamma%20Ray%20Detectors%0A%20%20%20%20%20%20Short_Name%3A%20HESSI%20IMAGER%0A%20%20%20End_Group%0A%20%20%20Group%3A%20Associated_Platforms%0A%20%20%20%20%20%20Short_Name%3A%20RHESSI%0A%20%20%20End_Group%0A%20%20%20Group%3A%20Spectral_Frequency_Information%0A%20%20%20%20%20%20Wavelength_Keyword%3A%20X-Ray%0A%20%20%20%20%20%20Number_Channels%3A%201%0A%20%20%20End_Group%0A%20%20%20Online_Resource%3A%20http%3A%2F%2Fhesperia.gsfc.nasa.gov%2Fhessi%2Finstrumentation.htm%0A%20%20%20Sample_Image%3A%20http%3A%2F%2Fhesperia.gsfc.nasa.gov%2Fhessi%2Fimages%2FGrid_Tray_Front.jpg%0A%20%20%20Group%3A%20Instrument_Logistics%0A%20%20%20%20%20%20Instrument_Start_Date%3A%202002-02-05%0A%20%20%20%20%20%20Instrument_Owner%3A%20NASA%2FGSFC%0A%20%20%20End_Group%0AEnd_Group%22){kind=link}