BaII 4554 angstrom speckle imaging as solar Doppler diagnostic

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