Coronal multichannel polarimeter for Lomnický štít Observatory. (Slovak Title: Koronálny multikanálový polarimeter pre observatórium Lomnický štít)

Details Coronal multichannel polarimeter for Lomnický štít Observatory. (Slovak Title: Koronálny multikanálový polarimeter pre observatórium Lomnický štít) Coronal multichannel polarimeter for Lomnický štít Observatory. (Slovak Title: Koronálny multikanálový polarimeter pre observatórium Lomnický štít)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010nspm.conf..196r&link_type=abstract

Proceedings of the 20th National Solar Physics Meeting, held 31 May - 4 June, 2010 in Papradno, Slovakia, p. 196-200

Physics

Scientific paper

The contribution presents the process of development and preparation of the Coronal Multi-channel Polarimeter (COMP-S) for the Lomnický štít Observatory of the SAS Astronomy Institute. The design of the device is based on the experience gained in recent years with the CoMP (High Altitude Observatory / NCAR; Boulder, USA) instrument. The device will be a combination of two main optical components: the Lyot tunable filter and polarimeter, and is prepared specifically for one of the 20 cm Zeiss coronagraph at the Lomnický štít Observatory where it will be installed in 2011. CoMP-S will differ from its predecessor in several respects. The most important difference is that CoMP-S will be able to observe the corona and chromospheric emission lines in the wavelength range from 530 to 1083 nm. This feature will be achieved using superachromatic wave plates and dichroic polarizers with wide bandwidth. Furthermore, in the CoMP-S instrument new SWIFT liquid crystals of Meadowlark Optics company will be used as variable retarders instead of nematic liquid crystal retarders (LCVR) which will considerably shorten the measuring process. Ferroelectric liquid crystals will provide measurements of the full Stokes vector with nearly optimal polarization throughout the whole instrument bandwidth. Recently developed sCMOS cameras are to provide diffraction limit resolution of observations, with the 860x680 arc second field and 30-frames-per-second cadence. The device will be used in the Astronomical Observatory of SAS at Lomnický štít primarily for spectrum polarimetry of prominences and coronal loops of the active solar regions.

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