Ferroelectric Liquid Crystal Polarimeter for High-cadence Hα Imaging Polarimetry

Details Ferroelectric Liquid Crystal Polarimeter for High-cadence Hα Imaging Polarimetry Ferroelectric Liquid Crystal Polarimeter for High-cadence Hα Imaging Polarimetry

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004soph..222..265h&link_type=abstract

Solar Physics, v. 222, Issue 2, p. 265-278 (2004).

Physics

13

Scientific paper

We developed a polarimeter with ferroelectric liquid crystals (FLCs) to observe polarization of flare kernels in the Hα line. Polarization is one of the important diagnostics of the high-energy particles in solar flares, and high-cadence imaging polarimetry with the precision of the order of 0.1% is required to observe the polarization of flare kernels. However, to achieve such high precision is difficult mainly due to the seeing-induced polarization error, which particularly appears around the flare kernels, because the brightness gradient is steep there. To reduce the seeing-induced error, a high modulation frequency is required, and our new polarimeter based on the combination of a high-speed CCD camera and FLCs realized high-frequency polarization modulation nearly 250 Hz. We evaluated the polarization error, and confirmed that the error was significantly reduced with the new polarimeter. We concluded that the polarimeter with FLCs meets the requirement of solar flare polarimetry.

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