Chromospheric polarity reversal on sunspots: New insight from spectro-polarimetric measurements

Details Chromospheric polarity reversal on sunspots: New insight from spectro-polarimetric measurements Chromospheric polarity reversal on sunspots: New insight from spectro-polarimetric measurements

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403l..33b&link_type=abstract

Astronomy and Astrophysics, v.403, p.L33-L36 (2003)

Astronomy and Astrophysics

Astrophysics

3

Sun: Magnetic Field, Sun: Photosphere, Sun: Chromosphere

Scientific paper

We present here spectro-polarimetric observations of chromospheric and photospheric lines on an active region. We show that the presence of polarity reversal between photosphere and chromosphere cannot be detected relying on magnetograms and broad band and even narrow band filters only. We demonstrate that opposite signs in CaII magnetograms in sunspots compare to photospheric magnetograms are not due to a reversal of the magnetic field, but rather due to the presence of line core emission as suggested from theoretical arguments by Sánchez Almeida (\cite{Sanchez97}).

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