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Proceedings Paper

Calibration of a ground-based solar coronal polarimeter
Author(s): David F. Elmore; Joan T. Burkepile; J. Anthony Darnell; Alice R. Lecinski; Andrew L. Stanger
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Paper Abstract

The Mk4 K-coronameter records polarization brightness images of the solar corona from the Mauna Loa Solar Observatory, Hawaii, USA. Calibration is required to quantitatively measure coronal polarization brightness, which in turn is used to infer coronal electron density. Matrix techniques are used to map the instrument polarization response. Brightness scaling depends upon precise knowledge of properties of an opal glass attenuator and calibration polarizer, sky transmission, and telescope pointing. In addition, account must be made for polarization at the objective lens and from the terrestrial atmosphere. Calibration parameters are stable to a few percent over a day, but when coupled with uncertainties in calibration optics values, sky transmission, and pointing, the average measurement uncertainty is ±15% ±6×10-9 pB/BSun.

Paper Details

Date Published: 14 February 2003
PDF: 10 pages
Proc. SPIE 4843, Polarimetry in Astronomy, (14 February 2003); doi: 10.1117/12.459279
Show Author Affiliations
David F. Elmore, National Ctr. for Atmospheric Research (United States)
Joan T. Burkepile, National Ctr. for Atmospheric Research (United States)
J. Anthony Darnell, National Ctr. for Atmospheric Research (United States)
Alice R. Lecinski, National Ctr. for Atmospheric Research (United States)
Andrew L. Stanger, National Ctr. for Atmospheric Research (United States)


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

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