Abstract

A solid Fabry–Perot etalon with a 0.16Å passband was used during the 180s 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 0.0011ÅV1. During the eclipse, 18 filtergrams were obtained at six 0.22Å steps across the profile of the forbidden [Fe X] spectral emission line at 6374.4Å, which results from the 106K coronal plasma. The 9.3×9.3 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 10kms1 velocities in the line of sight.

© 2008 Optical Society of America

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