A solid Fabry–Perot etalon with a passband was used during the solar eclipse of 2006 for rapid scans of an emission line of the solar corona. The etalon was a Y-cut lithium niobate wafer coated with reflective and conductive (ITO) layers. Voltage applied perpendicular to the etalon face produced a passband shift of . During the eclipse, 18 filtergrams were obtained at six steps across the profile of the forbidden [Fe X] spectral emission line at , which results from the coronal plasma. The arcmin field of view showed the structure of the corona above a newly emerged sunspot region. We discuss tests performed on the etalon before and after the eclipse. We also discuss the coronal observations, which show some features with velocities in the line of sight.
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