Bibcode
Martínez González, M. J.; Collados, M.; Ruiz Cobo, B.; Beck, C.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 477, Issue 3, January III 2008, pp.953-965
Advertised on:
1
2008
Revista
Número de citas
68
Número de citas referidas
57
Descripción
Aims:We study the contradictory magnetic field strength distributions
retrieved from independent analyses of spectropolarimetric observations
in the near-infrared (1.56 μm) and in the visible (630 nm) spectral
ranges in internetwork regions. Methods: To solve this apparent
controversy, we present simultaneous and co-spatial 1.56 μm and 630
nm observations of an internetwork area. The properties of the circular
and linear polarization signals, as well as the Stokes V area and
amplitude asymmetries, are discussed. As a complement, we also used
inversion techniques to infer the physical parameters of the solar
atmosphere. As a first step, the infrared and visible observations are
analysed separately to check their compatibility. Finally, the
simultaneous inversion of the two data sets is performed. Results: The magnetic flux densities retrieved from the individual
analysis of the infrared and visible data sets are strongly correlated.
The polarity of the Stokes V profiles is the same at co-spatial pixels
in both wavelength ranges. This indicates that both 1.56 μm and 630
nm observations trace the same magnetic structures on the solar surface.
The simultaneous inversion of the two pairs of lines reveals an
internetwork full of sub-kG structures that fill only 2% of the
resolution element. A correlation is found between the magnetic field
strength and the continuum intensity: equipartition fields (B˜ 500
G) tend to be located in dark intergranular lanes, whereas weaker field
structures are found inside granules. The most probable unsigned
magnetic flux density is 10 Mx/cm^2. The net magnetic flux density in
the whole field of view is nearly zero. This means that both polarities
cancel out almost exactly in our observed internetwork area.
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