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Proceedings Paper

SDO EVE ESP radiometric calibration and results
Author(s): Leonid Didkovsky; Darrell Judge; Seth Wieman; Tom Woods; Phil Chamberlin; Andrew Jones; Frank Eparvier; Matt Triplett; Don Woodraska; Don McMullin; Mitch Furst; Rob Vest
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Paper Abstract

The Solar Dynamics Observatory (SDO) Extreme ultraviolet Spectro-Photometer (ESP), as a part of the Extreme ultraviolet Variability Experiment (EVE) suite of instruments, was calibrated at the National Institute of Standards and Technology (NIST) on the Synchrotron Ultraviolet Radiation Facility (SURF) Beam Line 2 in February 2007. Precise ESP alignment to the SURF beam was achieved through successive scans in X, Y, Pitch and Yaw, using a comparison of the four channels of the ESP quad photodiode as a measure of alignment. The observed alignment between the ESP and the other instruments in the EVE package was found to be in very good agreement with that measured at the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado during ESP/EVE integration. The radiometric calibration of the ESP photometers in the spectral range around 4.4 nm (central zeroth order), and the four first order channels centered at about 18.9, 25.4, 29.8, and 36.1 nm was performed with SURF synchrotron radiation. The co-alignment of the SURF beam and the ESP optical axis for each energy and injected current was determined based on quad diode (QD) photometer responses (photodiode count-rate data). This determined beam position was later used to obtain exact energy-wavelength-flux profiles for each of the calibration energies and to calculate the quantum efficiency of the ESP channels. The results of this calibration (quantum efficiencies) are compared to the previous ESP NIST calibration results at SURF Beam Line 9 and to SOHO/SEM efficiencies.

Paper Details

Date Published: 20 September 2007
PDF: 12 pages
Proc. SPIE 6689, Solar Physics and Space Weather Instrumentation II, 66890P (20 September 2007); doi: 10.1117/12.732868
Show Author Affiliations
Leonid Didkovsky, Univ. of Southern California (United States)
Darrell Judge, Univ. of Southern California (United States)
Seth Wieman, Univ. of Southern California (United States)
Tom Woods, Univ. of Colorado, Boulder (United States)
Phil Chamberlin, Univ. of Colorado, Boulder (United States)
Andrew Jones, Univ. of Colorado, Boulder (United States)
Frank Eparvier, Univ. of Colorado, Boulder (United States)
Matt Triplett, Univ. of Colorado, Boulder (United States)
Don Woodraska, Univ. of Colorado, Boulder (United States)
Don McMullin, Praxis Inc. (United States)
Mitch Furst, National Institute of Standards and Technology (United States)
Rob Vest, National Institute of Standards and Technology (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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