Physics – Optics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0305s&link_type=abstract
American Astronomical Society, SPD meeting #42, #3.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Physics
Optics
Scientific paper
Of spectral diagnostics for the magnetic field in the solar chromosphere, the He I triplet at 1083 nm offers a comparatively simple means to determine both the magnitude and direction of the field vector. The triplet forms over a narrow range of heights when compared to strong optical lines, and recently the mechanisms that influence its polarization have been well characterized, thus allowing inversions of the magnetic field from observed Stokes profiles. We discuss recent work with the Facility Infrared Spectropolarimeter (FIRS) at the Dunn Solar Telescope (DST), New Mexico, USA to measure and infer the magnetic field vector of chromospheric fibrils. FIRS is designed to perform fast diffraction-limited dual-beam spectropolarimetry simultaneously at visible and infrared wavelengths through the use of multiple slits and narrowband filters. It can be operated in congress with the High Order Adaptive Optics (HOAO) system of the DST as well as with the Interferometric BiDimensional Spectropolarimeter (IBIS). Here we present high-resolution FIRS observations of chromospheric fibrils which employ the HOAO system under great seeing. We calibrate these observations for the full effect of the FIRS-DST combined analysis system on the Stokes vector which allow us to define the observed Stokes geometry with respect to solar coordinates. Full inversions of our measurements incorporating the effects of atomic polarization, the Hanle effect, and the Zeeman effect will be presented showing support for chromospheric fibrils that are aligned with the magnetic field direction.
Penn Matt J.
Schad Thomas A.
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