Narrow-band full Stokes polarimetry of small structures on the Sun with speckle methods

Details Narrow-band full Stokes polarimetry of small structures on the Sun with speckle methods Narrow-band full Stokes polarimetry of small structures on the Sun with speckle methods

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...480..265b&link_type=abstract

Astronomy and Astrophysics, Volume 480, Issue 1, March II 2008, pp.265-275

Astronomy and Astrophysics

Astrophysics

34

Sun: Magnetic Fields, Techniques: High Angular Resolution, Techniques: Polarimetric

Scientific paper

Aims:For the detection and the study of small-scale magnetic fields on the Sun, it is important to obtain observations with both high spatial resolution and high polarimetric sensitivity. Methods: A second narrow-band etalon and a full Stokes polarimeter, based on ferroelectric liquid crystals, were implemented in the two-dimensional “Göttingen” Fabry-Perot spectrometer/polarimeter at the Vacuum Tower Telescope, Observatorio del Teide/Tenerife. First observations with the Fe I 6173 Å line and their data analysis with speckle methods are described. Results: The new polarimeter yields magnetograms of a field of view of 31 arcsec×52 arcsec with minimised seeing induced signals and without spurious signals as from the use of beam-splitting calcites. The achieved spatial and temporal resolution are 0.30-0.35 arcsec and 36 s, respectively. With a detection limit for the field strength of 16 G (\cor3σ), a polarimetric sensitivity of 7-8×1015 Mx is obtained. Examples of intensity maps, Dopplergrams, and magnetograms from quiet and active regions on the Sun are discussed. Some of the results on solar magnetism are on 1) a pore with small-scale structure where we find a region with very low temperature gradient, 2) polar faculae with strong magnetic field signals and weaker signals in other areas surrounding them, and 3) small-scale inter-network magnetic fields with area fillings in the resolution elements of the order of 0.15.

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