SDO EVE ESP radiometric calibration and results

Leonid Didkovsky; Darrell Judge; Seth Wieman; Tom Woods; Phil Chamberlin; Andrew Jones; Frank Eparvier; Matt Triplett; Don Woodraska; Don McMullin; Mitch Furst; Rob Vest

doi:10.1117/12.732868

20 September 2007 SDO EVE ESP radiometric calibration and results

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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Proceedings Volume 6689, Solar Physics and Space Weather Instrumentation II; 66890P (2007) https://doi.org/10.1117/12.732868
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

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.

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Leonid Didkovsky, Darrell Judge, Seth Wieman, Tom Woods, Phil Chamberlin, Andrew Jones, Frank Eparvier, Matt Triplett, Don Woodraska, Don McMullin, Mitch Furst, and Rob Vest "SDO EVE ESP radiometric calibration and results", Proc. SPIE 6689, Solar Physics and Space Weather Instrumentation II, 66890P (20 September 2007); https://doi.org/10.1117/12.732868

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