Data Set Caveats (OCP 1.2 / 1.3)
The Data Center is aware that there are a number of issues with the ViSP data sets that were taken for you. In this latest run, fixes were made to:
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Figure 1: Observed and Atlas Spectrum for Ca II 8542 A.
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Christian, the The ViSP instrument scientist has supplied a better approximate calibration of the wavelength in the 3 arms, show below in pseudo code.
630 = 629.495+findgen(1000)*1.285/1000. ; dispersion 1.285 pm /px
397 = 396.418+findgen(1000)*0.77/1000. ; dispersion 0.77 pm / px
854 = 853.182+findgen(1000)*1.882/1000. ; dispersion 1.882 pm / px
Please be aware that the V->Q, V->U cross-talk is likely quite large at least in the 630nm channel. The Data Center Calibrations Team are working with Christian Beck, the ViSP Instrument Scientist to quantify this, and it will likely be addressed in upcoming pipeline software releases. For the moment, the user will need to apply corrections for this themselves.
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In addition, there are other limitations inherent to the Operations Commissioning Phase (shared-risk environment). In the course of the last months we learned a lot more about the instruments and the environment that they are operated in and some prior unknown technical limitations were encountered. Some of these limitations had an impact on the frame rate and as such the time spent on an individual slit position and map cadences the ViSP can achieve. These limitations are worked on and we expect them to be resolved in the very near future. In general, summit science operations staff (i.e. resident scientists and science operations specialists) strives to match the requests of any observing proposal the best they can, but there are no guarantees that for example, the lengths of observations, cadences or requested seeing will be 100% consistent with the proposal. If you do have any remaining questions about (summit) science operations and the execution of your observing program(s) you may also contact the DKIST Program Scientist for Operations atritschler@nso.edu or use the DKISTHelp Desk Help Desk at (https://nso.atlassian.net/servicedesk/customer/portals). Again, please bear in mind that this is not the final calibration run for your data sets. When this occurs, you will receive a formal notification from the Data Center and your data will be available through all the channels such as the User Portal. Please also note that, if your proposal called for supporting VBI data, this is not yet available. The VBI team is working diligently to fix some issues that have prevented automated speckle reconstruction of the data. It is expected that VBI data sets will be available in the short term and you will be notified separately about that. Please don't hesitate to contact us if you have questions. AlisdairDKIST Data Center Scientistadavey@nso.edu Alexandra TritschlerDKIST Program Scientist for Operationsatritschler@nso.edu DKIST Help Desk - https://nso.atlassian.net/servicedesk/customer/portals