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Proceedings Paper

Motivation; design, and development of 12-um imaging stokes polarimeters for solar magnetic field studies
Author(s): Drake Deming; Donald E. Jennings; George H. McCabe; Thomas Moran; Pedro Sada; Kimberly A. Ennico
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Paper Abstract

We discuss the scientific motivations, design considerations, and development status of imaging Stokes polarimeters based on the extremely Zeeman-senstive infrared emission line of MgI at 12.32 μm. The resolved Zeeman splitting exhibited by this far-infrared line enables significant progress on many problems in solar physics. These problems include vertical gradients in field strength, the magnetic structure of sunspots, the nature of magnetic energy release associated with solar flares, the measurement of horizontal currents in solar active regions, improved measurements of vertical currents, direct measurement of photospheric reconnection, the occurrence and nature of weak magnetic fields, and other problems. We discuss why 12 μm measurements are well suited to these investigations, and we comment on the capability of current instrumentation to enable these studies. Several instruments currently exist to perform 12 μm Stokes polarimetry: a Fabry-Perot system, a grating spectrometer, and the McMath-Pierce Fourier transform spectrometer (which remains crucial for many aspects). We elaborate on some design considerations and development issues, and discuss the optimal approach to be taken in future 12 μm imaging Stokes polarimetry.

Paper Details

Date Published: 11 February 2003
PDF: 10 pages
Proc. SPIE 4853, Innovative Telescopes and Instrumentation for Solar Astrophysics, (11 February 2003); doi: 10.1117/12.460372
Show Author Affiliations
Drake Deming, NASA Goddard Space Flight Ctr. (United States)
Donald E. Jennings, NASA Goddard Space Flight Ctr. (United States)
George H. McCabe, NASA Goddard Space Flight Ctr. (United States)
The Catholic Univ. of America (United States)
Thomas Moran, NASA Goddard Space Flight Ctr. (United States)
The Catholic Univ. of America (United States)
Pedro Sada, Univ. de Monterrey (Mexico)
Kimberly A. Ennico, NASA Ames Research Ctr. (United States)

Published in SPIE Proceedings Vol. 4853:
Innovative Telescopes and Instrumentation for Solar Astrophysics
Stephen L. Keil; Sergey V. Avakyan, Editor(s)

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