Bibcode
Sánchez Almeida, J.
Referencia bibliográfica
AG Abstract Services, vol. 15. Abstracts of Contributed Talks and Posters presented at the Annual Scientific Meeting of the Astronomische Gesellschaft, in Goettingen, 20-25 September 1999.
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1999
Número de citas
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Número de citas referidas
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Descripción
Observations and theory both point out that the magnetic photosphere is
not smooth but irregular at optically-thin scales. The relevance of
these irregularities for a proper magnetic field diagnostics depends
upon the not yet known structure of the magnetic field fluctuations
(and, of course, on the purpose of our determination). Sánchez
Almeida & Lites (1999) analyze quiet Sun network and internetwork
Stokes profiles allowing for optically thin fluctuations (i.e., they use
MIcro-Structured Magnetic Atmospheres). The retrieved semi-empirical
quiet Sun model atmospheres present several conspicuous
counter-intuitive properties. If these models contain the essentials of
the real Sun then standard quiet Sun magnetic field determinations are
seriously biased. This contribution presents and discusses some of these
unexpected properties: the IR Fe i 15648 Å line is rather
insensitive to strong kG fields; large magnetic field strengths can
easily escape detection; unresolved mixed polarities seems to be the
rule when dealing with most of the solar surface, that is to say, when
measuring the signals that may be carrying most of the solar magnetic
flux, etc. The conclusion to be drawn from these results is that
accounting for optically-thin fluctuations does matter for a proper
quiet Sun magnetic field diagnostics.