Abstract
We present a new coalignment method for the EUV Imaging Spectrometer (EIS) on board the Hinode spacecraft. In addition to the pointing offset and spacecraft jitter, this method determines the roll angle of the instrument, which has never been systematically measured, and which is therefore usually not corrected. The optimal pointing for EIS is computed by maximizing the cross-correlations of the Fe xii 195.119 Å line with images from the 193 Å band of the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO). By coaligning 3336 rasters with high signal-to-noise ratio, we estimate the rotation angle between EIS and AIA and explore the distribution of its values. We report an average value of \((-0.387 \pm 0.007)^{\circ}\). We also provide a software implementation of this method that can be used to coalign any EIS raster.
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Acknowledgements
The authors would like to thank the anonymous referee for contributing to the improvement of this paper. Hinode is a Japanese mission developed and launched by ISAS/JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners. It is operated by these agencies in co-operation with ESA and NSC (Norway). AIA data are courtesy of NASA/SDO and the AIA science team. This work used data provided by the MEDOC data and operations centre (CNES/CNRS/Univ. Paris-Sud), medoc.ias.u-psud.fr . D.B. is funded under STFC consolidated grant number ST/N000722/1. The work of D.H.B., J.T.M., and H.P.W. was performed under contract with the Naval Research Laboratory and was funded by the NASA Hinode program. Software: Astropy (Astropy Collaboration et al., 2013, 2018), SolarSoft (Freeland and Handy, 2012).
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Pelouze, G., Auchère, F., Bocchialini, K. et al. Comprehensive Determination of the Hinode/EIS Roll Angle. Sol Phys 294, 59 (2019). https://doi.org/10.1007/s11207-019-1451-5
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DOI: https://doi.org/10.1007/s11207-019-1451-5