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Image Quality of the Helioseismic and Magnetic Imager (HMI) Onboard the Solar Dynamics Observatory (SDO) |
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| Authors: | R. Wachter J. Schou M. C. Rabello-Soares J. W. Miles T. L. Duvall Jr. R. I. Bush |
| Affiliation: | 1. Stanford University, Stanford, CA, 94305, USA 2. Lockheed Martin Advanced Technology Center, Palo Alto, CA, 94304, USA 3. SOFIA-USRA, NASA Ames Research Center MS N211-3, Moffett Field, CA, 94035, USA 4. Solar Physics Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD, 20771, USA |
| Abstract: | We describe the imaging quality of the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO) as measured during the ground calibration of the instrument. We describe the calibration techniques and report our results for the final configuration of HMI. We present the distortion, modulation transfer function, stray light, image shifts introduced by moving parts of the instrument, best focus, field curvature, and the relative alignment of the two cameras. We investigate the gain and linearity of the cameras, and present the measured flat field. |
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