On magnetic field ``reconstruction''

Details On magnetic field ``reconstruction'' On magnetic field ``reconstruction''

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...493.1121j&link_type=abstract

Astronomy and Astrophysics, Volume 493, Issue 3, 2009, pp.1121-1123

Astronomy and Astrophysics

Astrophysics

5

Polarization, Radiative Transfer, Techniques: Polarimetric, Sun: Chromosphere

Scientific paper

Context: Solanki and colleagues have presented intriguing 3D “reconstructions” of magnetic fields from the vector polarimetry of the He I 1083 nm multiplet. Aims: In this Research Note I re-examine the reconstruction technique used. Methods: Using a simple dipole field, I examine the reconstruction technique as applied to the theoretical fields. I assume that the He line forms in two locations, (1) along the magnetic loops and (2) in a horizontal plane. Results: The planar interpretation can account for all aspects of the data, but the loop interpretation has geometrical and physical problems. Conclusions: The data by themselves are not sufficient to determine which picture is more applicable. Nevertheless I argue that the planar interpretation makes more physical sense and that the early reconstructions lead to spurious results. I suggest additional tests that might help constrain the problem further.

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