Two-dimensional Spectropolarimetry At The Dunn Solar Tower

Details Two-dimensional Spectropolarimetry At The Dunn Solar Tower Two-dimensional Spectropolarimetry At The Dunn Solar Tower

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2605u&link_type=abstract

American Astronomical Society Meeting 210, #26.05; Bulletin of the American Astronomical Society, Vol. 39, p.324

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Measurement of the solar magnetic field within individual atmospheric structures is a desirable, but persistently challenging goal, in particular in chromospheric layers. Successful measurements over different heights would provide an important contribution to our understanding of the solar atmosphere and would provide valuable input for theoretical modeling. We provide a short description of the capabilities of the Interferometric BIdimensional Spectrometer (IBIS), which has recently been upgraded to full Stokes capabilities. IBIS is installed at the Dunn Solar Tower (DST) at the Sacramento Peak observatory operated by NSO. Using IBIS we achieve high spatial resolution over a large field of view in both the photosphere and the chromosphere, which allows us to connect the observed profiles to the overall topology of the target region. After performing suitable calibrations for the telescope and instrument polarization properties, we can extract Stokes profiles for each point in the field of view. Stokes V profiles observed in the Ca II 854.2 nm line show a large variety of forms, indicating widely varying vertical behavior of the field strength, velocity, and temperature. We examine the center-of-gravity method for determining a representative field strength from the observed profiles looking at observations and comparing with simulated profiles.

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