Ba II 4554 Å speckle imaging as solar Doppler diagnostic

Details Ba II 4554 Å speckle imaging as solar Doppler diagnostic Ba II 4554 Å speckle imaging as solar Doppler diagnostic

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...378..251s&link_type=abstract

Astronomy and Astrophysics, v.378, p.251-256 (2001)

Astronomy and Astrophysics

Astrophysics

14

Sun: Atmosphere, Sun: Photosphere, Sun: Faculae, Plages, Techniques: Image Processing -, Instrumentation: Miscellaneous

Scientific paper

We present observations testing the Dopplergram capability of a narrow-band (80 mÅ) Lyot filter imaging the solar surface in the wings of the Ba II 4554 Å resonance line in combination with speckle reconstruction to obtain high angular resolution. The Ba II 4554 Å line is found to be an excellent tool for high-resolution Doppler mapping thanks to opacity insensitivity to temperature variations and line-width insensitivity to thermal broadening. The resulting Dopplergrams show concentrated downflows of 1.2-2.2 km;s-1 in intergranular lanes that probably mark magnetic fluxtubes. Two-wavelength profile sampling is found to suffice for high-resolution Dopplergram construction. The filter will be installed as part of a multi-wavelength speckle imaging system on the new Dutch Open Telescope.

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