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Observing the solar corona with a tunable Fabry-Perot filter View all abstracts by submitter

David Rust   Submitted: 2008-12-23 12:11

A solid Fabry-Perot etalon with a 0.16 ? passband was used during the 180 s 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 0.0011 ? V-1. During the eclipse, 18 filtergrams were obtained at six 0.22 ? steps across the profile of the forbidden [Fe X] spectral emission line at 6374.4 ?, which results from the 106 K 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 10 km s-1 velocities in the line of sight.

Authors: Matthew W. Noble, David M. Rust, Pietro N. Bernasconi, Jay M. Pasachoff, Bryce A. Babcock, and Megan A. Bruck
Projects: None

Publication Status: Published in Applied Optics, Vol. 47, Issue 31, pp. 5744-5749 doi:10.1364/AO.47.005744
Last Modified: 2008-12-23 12:26
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