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Solar Physics

, Volume 275, Issue 1–2, pp 145–178 | Cite as

Extreme Ultraviolet Variability Experiment (EVE) Multiple EUV Grating Spectrographs (MEGS): Radiometric Calibrations and Results

  • R. A. Hock
  • P. C. Chamberlin
  • T. N. Woods
  • D. Crotser
  • F. G. Eparvier
  • D. L. Woodraska
  • E. C. Woods
Open Access
The Solar Dynamics Observatory

Abstract

The NASA Solar Dynamics Observatory (SDO), scheduled for launch in early 2010, incorporates a suite of instruments including the Extreme Ultraviolet Variability Experiment (EVE). EVE has multiple instruments including the Multiple Extreme ultraviolet Grating Spectrographs (MEGS) A, B, and P instruments, the Solar Aspect Monitor (SAM), and the Extreme ultraviolet SpectroPhotometer (ESP). The radiometric calibration of EVE, necessary to convert the instrument counts to physical units, was performed at the National Institute of Standards and Technology (NIST) Synchrotron Ultraviolet Radiation Facility (SURF III) located in Gaithersburg, Maryland. This paper presents the results and derived accuracy of this radiometric calibration for the MEGS A, B, P, and SAM instruments, while the calibration of the ESP instrument is addressed by Didkovsky et al. (Solar Phys., 2010, doi:  10.1007/s11207-009-9485-8 ). In addition, solar measurements that were taken on 14 April 2008, during the NASA 36.240 sounding-rocket flight, are shown for the prototype EVE instruments.

Keywords

SDO EVE Solar EUV irradiance Calibration Synchrotron 

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Copyright information

© The Author(s) 2010

Authors and Affiliations

  • R. A. Hock
    • 1
  • P. C. Chamberlin
    • 2
  • T. N. Woods
    • 1
  • D. Crotser
    • 1
  • F. G. Eparvier
    • 1
  • D. L. Woodraska
    • 1
  • E. C. Woods
    • 3
  1. 1.Laboratory for Atmospheric and Space PhysicsBoulderUSA
  2. 2.Solar Physics Laboratory, Code 671NASA Goddard Space Flight CenterGreenbeltUSA
  3. 3.Rhodes CollegeMemphisUSA

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