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| Paper: |
Observations of the Solar Atmosphere by the SUMER Spectrometer on SOHO |
| Volume: |
118, First Advances in Solar Physics Euroconference: Advances in the Physics of Sunspots |
| Page: |
259 |
| Authors: |
Wilhelm, Klaus; The Sumer Consortium |
| Abstract: |
SUMER -- the Solar Ultraviolet Measurements of Emitted Radiation instrument on the Solar and Heliospheric Observatory (SOHO) -- observed its first light on January 24, 1996. The instrument can measure in the wavelength range from below 500 to 1610 { Angstroms}. Many features and areas of the Sun and their spectra have been observed since, including coronal holes, polar plumes and active regions. The atoms and ions emitting this radiation exist at temperatures below 2 x 10(6) K and are thus ideally suited to investigate the solar transition region where the temperature increases from chromospheric to coronal values. Detailed line profiles with spectral resolution elements between 21 and 45 m{ Angstroms} are produced for each lin e at each spatial location along the slit. From the line width, intensity and wavelength position we are able to deduce temperature, density, and velocity of the emitting atoms and ions for each emission line and spatial element in the spectroheliogram. |
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