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Proceedings Paper

SDO-EVE EUV spectrograph optical design and performance
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Paper Abstract

The NASA Solar Dynamics Observatory (SDO), scheduled for launch in 2009, incorporates a suite of instruments including the EUV Variability Experiment (EVE). The EVE instrument package contains grating spectrographs that will measure the solar extreme ultraviolet (EUV) irradiance from 0.1 to 105 nm. The Multiple EUV Grating Spectrograph (MEGS) channels use concave reflection gratings to image solar spectra onto CCDs. MEGS will provide 0.1nm spectral resolution between 5-105nm every 10 seconds with an absolute accuracy of better than 25% over the SDO 5- year mission. MEGS-A utilizes a unique grazing-incidence, off-Rowland circle (RC) design to minimize angle of incidence at the detector while providing ≥ 0.1nm resolution between 5-37 nm. MEGS-B utilizes a double-pass, cross-dispersed double-Rowland circle design while providing ≥ 0.1nm resolution between 35-105 nm. We present the as-built performance of the MEGS optical design, including spectral resolution, wavelength shift, focus and alignment.

Paper Details

Date Published: 20 September 2007
PDF: 11 pages
Proc. SPIE 6689, Solar Physics and Space Weather Instrumentation II, 66890M (20 September 2007); doi: 10.1117/12.732592
Show Author Affiliations
David A. Crotser, Lab. for Atmospheric and Space Physics (United States)
Thomas N. Woods, Lab. for Atmospheric and Space Physics (United States)
Francis G. Eparvier, Lab. for Atmospheric and Space Physics (United States)
Matthew A. Triplett, Lab. for Atmospheric and Space Physics (United States)
Donald L. Woodraska, Lab. for Atmospheric and Space Physics (United States)


Published in SPIE Proceedings Vol. 6689:
Solar Physics and Space Weather Instrumentation II
Silvano Fineschi; Rodney A. Viereck, Editor(s)

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