Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh41a12m&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH41A-12
Other
7509 Corona, 7546 Transition Region, 7594 Instruments And Techniques
Scientific paper
Emission lines in the extreme ultraviolet spectral region provide a sensitive probe of the high-temperature plasma in the solar transition region and corona. Simultaneously achieving high spatial, spectral, and temporal resolution in this wavelength region has been challenging. We describe the design and capabilities of the Extreme Ultraviolet Imaging Spectrometer (EIS) planned for flight on the Japanese Solar-B satellite. EIS consists of a multilayer-coated off-axis telescope mirror and a multilayer-coated toroidal grating spectrometer. The telescope mirror forms a solar image on the spectrometer entrance slit assembly and the spectrometer forms stigmatic spectra of the solar region isolated by the 1024 arcsec high slit. The instrument includes thin-film aluminum filters to reject longer wavelength radiation and CCD detectors at the focal plane. Articulation of the primary mirror provides roughly 1600 arcsec of east-west coarse pointing freedom and 360 arcsec of fine east-west motion for rastering. Monochromatic images are formed either by rastering the solar image across a narrow entrance slit or by using a very wide slit. Half of each optic is coated to optimize reflectance at 19.5 nm, and the other half to optimize reflectance at 27.0 nm. Each wavelength range is imaged onto a separate CCD detector. The EIS spectral range contains emission lines formed over a temperature range from roughly 0.1 to 20 MK. Bright lines in the selected wavelength bands will yield precision measurements of line-of-sight velocities and nonthermal plasma motions. This spectral range also includes several pairs of density-sensitive lines.
Brown Charles Max
Culhane Leonard J.
Dere Ken P.
Doschek George A.
Korendyke Clarence Marinus
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