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Design of a Full Stokes Polarimeter for Chromospheric Measurements with SOLIS/VSM

Published online by Cambridge University Press:  24 July 2015

S. Gosain  and
J. W. Harvey
S. Gosain
Affiliation:
National Solar Observatory, 950 N Cherry Avenue, Tucson 85719, Arizona, USA email: sgosain@nso.edu, jharvey@nso.edu
J. W. Harvey
Affiliation:
National Solar Observatory, 950 N Cherry Avenue, Tucson 85719, Arizona, USA email: sgosain@nso.edu, jharvey@nso.edu
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Abstract

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The synoptic observations of the magnetic field of the Sun have continued at the National Solar Observatory (NSO) since 1970s. The daily full-disk maps of the longitudinal magnetic field are regularly combined to form Carrington maps of the photospheric magnetic flux per solar rotation. These maps continue to be used by the international research community for a variety of studies related to solar magnetism as well as for space weather studies. The current NSO synoptic facility is the Synoptic Optical Long-term Investigation of the Sun (SOLIS), which regularly provides photospheric vector and chromospheric longitudinal full-disk magnetograms, among other data products. In the near future, an upgrade of SOLIS to produce chromospheric vector magnetograms is planned. We present the design of a new polarization modulator package for full Stokes polarimetry of the chromospheric Ca II 854.2 nm spectral line.

Keywords

Sun: chromosphereInstrumentation: polarimetersTechniques: polarimetric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S305: Polarimetry: From the Sun to Stars and Stellar Environments , December 2014 , pp. 186 - 190
Copyright
Copyright © International Astronomical Union 2015 

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