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Proceedings Paper

Stokes polarimeter for mid-IR solar magnetic field measurements
Author(s): George H. McCabe; Donald E. Jennings; Drake Deming; Pedro Sada; Thomas Moran
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Paper Abstract

A motorized rotating wave plate polarization analyzer has been built for modulating solar light as input to the Celeste high-resolution cryogenic grating spectrometer to record full Stokes parameter maps at 12 microns wavelength of areas around sunspot and plage regions. The instrument system was used at the McMath-Pierce (1.5 m aperture, f/54) solar telescope at Kitt Peak, where single position slit spectra are spatially 120 arc-sec long, with a double sampled spectral resolution of 0.036 cm-1. Stepper motor driven limb guiders and synchronized action of polarization wheels are under the control of the Celeste data system computer, allowing unattended programmable scanning with 2-3 arc-sec steps for several hours. The results are spatial maps of magnetic field strength and direction, strength measured directly to the level of a few hundred gauss, with a time resolution of approx. 5 minutes per slit position. In this presentation we describe the Mid-IR Stokes polarimetry instrument system, design and performance, and discuss plans for future development.

Paper Details

Date Published: 14 February 2003
PDF: 6 pages
Proc. SPIE 4843, Polarimetry in Astronomy, (14 February 2003); doi: 10.1117/12.458667
Show Author Affiliations
George H. McCabe, Institute for Astrophyscis and Computational Science, The Catholic Univ. of America (United States)
Donald E. Jennings, NASA Goddard Space Flight Ctr. (United States)
Drake Deming, NASA Goddard Space Flight Ctr. (United States)
Pedro Sada, Univ. de Monterrey (Mexico)
Thomas Moran, Ctr. for Solar Physics and Space Weather, The Catholic Univ. of America (United States)

Published in SPIE Proceedings Vol. 4843:
Polarimetry in Astronomy
Silvano Fineschi, Editor(s)

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