Preliminary results from the HAO/NSO Advanced Stokes Polarimeter prototype observing run.

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Scientific paper

A prototype version of the Advanced Stokes Polarimeter was operated at the Sunspot Vacuum Tower Telescope of the National Solar Observatory in May und June, 1990. Although the prototype instrument does not have the capability of the final instrument to be deployed in 1991, it nonetheless provided high spatial resolution Stokes profiles observations of a small symmetric sunspot. Analysis of these observations shows that the magnetic field at the outer edge of the penumbra of this sunspot is highly inclined with respect to the local normal (γ = 70 - 80°), in agreement with previous Stokes II measurements of larger sunspots. In addition, the axial field and flux distribution was found to be nearly identical to that of the previous Stokes II measurement.

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