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Forward-scattering Hanle effect in the solar Ca i 4227 Å line

Published online by Cambridge University Press:  27 June 2012

M. Faurobert ,
C. Fang ,
T. Corbard ,
H. Frisch ,
L.S. Anusha ,
M. Bianda ,
R. Holzreuter ,
K.N. Nagendra ,
R. Ramelli  and
M. Sampoorna
...Show all authors
H. Frisch
Affiliation:
UNS, CNRS, OCA, Laboratoire Cassiopée, 06304 Nice Cedex 04, France
L.S. Anusha
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bangalore 560 034, India
M. Bianda
Affiliation:
Istituto Ricerche Solari Locarno, Via Patocchi, 6605 Locarno-Monti, Switzerland
R. Holzreuter
Affiliation:
MPI für Sonnenforschung, 37191 Katlenburg-Lindau, Germany
K.N. Nagendra
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bangalore 560 034, India
R. Ramelli
Affiliation:
Istituto Ricerche Solari Locarno, Via Patocchi, 6605 Locarno-Monti, Switzerland
M. Sampoorna
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bangalore 560 034, India
H.N. Smitha
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bangalore 560 034, India
J.O. Stenflo
Affiliation:
Istituto Ricerche Solari Locarno, Via Patocchi, 6605 Locarno-Monti, Switzerland Institute of Astronomy, ETH Zürich, 8093 Zürich, Switzerland
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Abstract

High sensitivity spectropolarimetric observations of the four Stokes parameters of the solar Ca i 4227 Å line have been performed in October 2010 at IRSOL with the ZIMPOL polarimeter, near the disk center, outside an active region (Bianda et al. 2011). They were analyzed in Anusha et al. 2011 with a combination of detailed radiative transfer modelling of the Hanle effect for the linear polarization and weak field Zeeman approximation for the circular polarization. This approach made possible a unique determination of the magnetic field vector at various positions along the slit of the spectrograph. A summary of the observations and of their analysis is presented here.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 55: 4th French-Chinese Meeting on Solar Physics - Understanding Solar Activity: Advances and Challenges , 2012 , pp. 59 - 63
Copyright
© EAS, EDP Sciences 2012

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References

Anusha, L.S., Nagendra, K.N., Bianda, M., et al., 2011, ApJ, 737, 95 CrossRef
Bianda, M., Ramelli, R., Anusha, L.S., et al., 2011, A&A, 530, L13
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