Bibcode
Socas-Navarro, Hector; Elmore, David F.; Keller, Christoph U.; Seagraves, Paul H.; Streander, Kim V.; Card, Gregory L.; Warner, Mark; Kuhn, Jeffrey R.; Mickey, Donald L.
Referencia bibliográfica
Solar Physics and Space Weather Instrumentation. Edited by Fineschi, Silvano; Viereck, Rodney A. Proceedings of the SPIE, Volume 5901, pp. 52-59 (2005).
Advertised on:
8
2005
Número de citas
12
Número de citas referidas
11
Descripción
This paper addresses the issue of calibrating the Advanced Technology
Solar Telescope for high-precision polarimetry, in particular of the
optical train above the Gregorian station (where suitable calibration
optics will be placed). Conventional techniques would not be adequate
for this telescope given its large aperture. Here we explore two
different methods that are currently being considered by the design
team. The first one is the "sub-aperture" method, which uses small
calibration optics above the primary mirror to calibrate a small
sub-aperture of the system. This calibration is then extended to the
full aperture by means of actual observations. The second method is
based on analyzing the polarization observed in a spectral line with a
peculiar Zeeman pattern, such as the FeII 614.9 nm line, which does not
produce any intrinsic linear polarization. Numerical simulations are
presented that show the robustness of both techniques and their
respective advantages and disadvantages are discussed.