The first light of the Infrared Imaging Magnetographat Big Bear Solar Observatory

Details The first light of the Infrared Imaging Magnetographat Big Bear Solar Observatory The first light of the Infrared Imaging Magnetographat Big Bear Solar Observatory

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0612c&link_type=abstract

American Astronomical Society, SPD meeting #37, #6.12; Bulletin of the American Astronomical Society, Vol. 38, p.227

Physics

Optics

Scientific paper

The InfraRed Imaging Magnetograph (IRIM) system developed by Big Bear Solar Observatory (BBSO) has been put into preliminary operation. It is one of the first imaging spectro-polarimeters working at 1565 nm, and is used for the observations of the Sun at its opacity minimum, exposing the deepest photospheric layers. The tandem system of a 4.2 nm interference filter, an unique 0.25 nm birefringent Lyot filter and a Fabry-Perot etalon is capable of providing a bandpass as low as 0.01 nm in a telecentric configuration. A fixed quarter wave plate and a nematic liquid crystal variable retarder are employed for analyzing the circular polarization of the Zeeman components. The longitudinal magnetic field is measured for highly Zeeman-sensitive Fe I line at 1564.85 nm (Lande factor g = 3). The polarimetric data, with a field of view (FOV) 145" × 145", were recorded by a 1024 × 1024 pixel, 14-bit HgCdTe CMOS focal plane array camera. Benefiting from the Correlation Tracking system (CT) and newly developed Adaptive Optics (AO) system, the first imaging polarimetric observations at 1565 nm were made at the diffraction limit on 1 July 2005 using BBSO's 65 cm telescope. After comparing the magnetograms from IRIM with those taken by the Michelson Doppler Imager (MDI) on board SOHO, it was found that all the magnetic features matched very well in both sets of magnetograms. Also, Stokes V profiles obtained from the Fabry-Perot etalon scanning data provide access to both the true magnetic field strength and filling factor of the small-scale magnetic flux elements. In this paper, we present the design, fabrication, and calibration of IRIM, as well as the results of the first scientific observations.

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