Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.3807b&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #38.07; Bulletin of the American Astronomical Society, Vol. 34, p.699
Astronomy and Astrophysics
Astronomy
Scientific paper
The number of available spectral lines to probe magnetic fields in the solar chromosphere from the ground is practically limited to resonance lines of hydrogen, calcium, sodium and magnesium and the multiplets of helium. The range of heights over which each these spectral lines form extends over several hundred kilometers and temperatures over several hundreds of degrees, in a significantly non-local thermodynamic equilibrium atmosphere. In this paper we explore the diagnostic potential of the CaII 8542 A spectral line and the inference of active region magnetic and velocity fields. We will provide a NLTE analysis of the radiative transfer of this spectral line in the presence of magnetic fields and compare theoretical and measured spectral line profiles (observed using the NSO/KP Vacuum Telescope), to infer magnetic field strengths using the center-of-gravity separation of the Stokes (I+V), (I-V) components, and using the weak field approximation.
Balasubramaniam K. S.
Havey J. W.
Jones Heath
Uitenbroek Han
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