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| Paper: |
ATST Telescope Calibration: Summary of Studies and their Conclusions |
| Volume: |
463, 2nd ATST-EAST Workshop in Solar Physics: Magnetic Fields from the Photosphere to the Corona |
| Page: |
307 |
| Authors: |
Elmore, D. F. |
| Abstract: |
The ATST Polarimetry Working Group (PWG) has concluded that ATST
telescope calibration will be performed using solar data
themselves. Two studies prepared for the PWG contributing to that
conclusion are presented. The first study utilizes a model of 630 nm
Stokes profiles generated in solar active network as input to a
polarization model of the ATST primary and secondary
mirrors. Correlations among polarization parameters seen in the
resulting line profiles are used to infer properties of the mirrors
and compared to those values used to create the model telescope. In
this closed exercise, the inversion method was tuned to best recover
ATST mirror properties. The second of these studies applies this
correlation method to calibrated solar observations from the Dunn
Solar Telescope (Sacramento Peak, NM USA) over the course of a day
recorded by the Facility Infrared Spectro-polarimeter at 630 nm to
infer the polarization properties of the telescope entrance window,
turret mirrors, and exit window. The fidelity of the fit to the
inferred parameters when scaled to the polarization levels of ATST
indicates the applicability of this technique to that new telescope. |
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