Using the Na I D resonance lines to probe the solar photosphere

Details Using the Na I D resonance lines to probe the solar photosphere Using the Na I D resonance lines to probe the solar photosphere

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..199e&link_type=abstract

In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,

Physics

Solar Photosphere, Helioseismology

Scientific paper

Observational techniques in helioseismology are often based on measurements made in the Na I D resonance lines. A good knowledge of their spectral profiles is crucial for the purposes of calibration and interpretation of data. Here we explore their diagnostic properties by calculating response functions of the D1 and D2 line profiles to temperature and velocity perturbations in the atmosphere. We propose a method to transform spectral line intensity fluctuations measured at several wavelenths into temperature and velocity disturbances at different height levels. The possibilities of such a procedure to trace the vertical structure of the photosphere are discussed.

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