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- The Coronal Diagnostics Spectrometer (CDS) experiment on the Solar Heliospheric Observatory (SOHO) spacecraft is designed to determine such information through the study of emission line characteristics in the extreme ultraviolet (EUV) - particularly essential for the detection of emission from the hottest plasmas in the (non-flare) solar atmosphere. This is complementary to the remaining coronal instrument package on SOHO which includes a longer-wavelength UV spectrometer, an EUV imager and two coronagraphs (UV and white light).
The CDS consists of a Wolter II grazing incidence telescope which has a focus at a slit assembly which lies beyond a scan mirror. Light stops define two telescope apertures which feed, simultaneously into two spectrometers beyond the slit assembly. One portion of the beam hits a grating in grazing incidence and the spectrum is dispersed onto four 1-D detectors placed around the Rowland circle. This is the grazing incidence spectrometer or GIS. The other portion is fed through to a twin grating in normal incidence and the resulting spectrum is viewed by a 2-D detector system. This is the normal incidence spectrometer or NIS.
For more information, see:
http://solar.bnsc.rl.ac.uk/
Group: Instrument_Details
Entry_ID: CDS
Group: Instrument_Identification
Instrument_Category: Solar/Space Observing Instruments
Instrument_Class: Ultraviolet Instruments
Short_Name: CDS
Long_Name: Coronal Diagnostics Spectrometer
End_Group
Group: Associated_Platforms
Short_Name: SOHO
End_Group
Group: Spectral_Frequency_Information
Wavelength_Keyword: Ultraviolet
Number_Channels: 2
Spectral_Frequency_Coverage_Range: 15.0-80.0 nm
Spectral_Frequency_Resolution: 2 arcsec
End_Group
Online_Resource: http://solar.bnsc.rl.ac.uk/
Group: Instrument_Logistics
Instrument_Start_Date: 1995-12-02
Instrument_Owner: Rutherford Appleton Labs
End_Group
End_Group
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