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Instrument: SUMER : Solar Ultraviolet Measurements of Emitted Radiation
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Associated Platforms
SOHO

Spectral/Frequency Information
Wavelength Keyword: Ultraviolet
Number Channels: 2
Spectral/Frequency Coverage/Range: 390 - 1500 A

Related Data Sets
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Description
The Solar Ultraviolet Measurements of Emitted Radiation (SUMER) on SOHO:
- measure profiles and intensities of extreme ultraviolet (EUV) lines emitted
in the solar atmosphere ranging from the upper chromosphere to the lower
corona;
- determine line broadenings, spectral positions and Doppler shifts with high
precision and accuracy;
- provide stigmatic images of selected areas of the Sun in the EUV with high
spatial, temporal and spectral resolution and
- obtain full images of the Sun and the inner corona in selectable EUV lines,
corresponding to a temperature range from 10 000 to 2 000 000 K.

The optical design is based upon two parabolic mirrors, a plane mirror and a
spherical concave grating, all made of silicon carbide. The first off-axis
telescope parabola mirrors the Sun on the spectrometer entrance slit. The
second off-axis parabola collimates the beam leaving the slit. This beam is
then deflected by the plane mirror onto the grating. Two detectors, located in
the focal plane of the grating, collect the monochromatic images of the
spectrometer entrance slit. Coverage of the full spectral range of the
instrument requires a wavelength scan performed by rotating the plane mirror. A
baffle system, consisting of an entrance aperture, light traps, an aperture
stop, a pre-slit and a Lyot stop, completes the design.

For more information, see:
http://www.mps.mpg.de/projects/soho/sumer

Online Resources
http://www.mps.mpg.de/projects/soho/sumer/text/webluca/ch_inst.html

Instrument Logistics
Instrument Start Date: 1995-12-02
Instrument Owner: Max Planck Institute for Solar System Research