Last week, Hinode ran a coordinated observation program called HOP130. This collaboration
creates overlapograms for the Hinode Extreme Ultraviolet Imaging Spectrometer (EIS). The EIS instrument
has a narrow field of view and has to scan at each pointing to make a large image. Although, it takes a long time
to scan a region on the sun, the data from EIS is rich and provides information about the plasma that imagers cannot.
This coordination is run several times a year and is essential to calibrating between instruments including XRT and the Solar Dynamics Observatory.
XRT supported the observations by providing x-ray data in a few different filters. XRT has an extremely large field of view
and a single pointing at disk center would be enough to capture the full disk. But it is important to have data
at the closest time possible in order to get the best calibration.
To read more about EIS and overlapograms see the EIS Science Nugget.
Keywords: Full Disk, Hinode Pointing