Observing the solar corona with a tunable Fabry-Perot filter

A solid Fabry-Perot etalon with a 0.16 A 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...

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Bibliographic Details
Published in:Applied optics. Optical technology and biomedical optics 2008-11, Vol.47 (31), p.5744
Main Authors: Noble, Matthew W, Rust, David M, Bernasconi, Pietro N, Pasachoff, Jay M, Babcock, Bryce A, Bruck, Megan A
Format: Article
Language:English
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Summary:A solid Fabry-Perot etalon with a 0.16 A 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 A V(-1). During the eclipse, 18 filtergrams were obtained at six 0.22 A steps across the profile of the forbidden [Fe X] spectral emission line at 6374.4 A, which results from the 10(6) K coronal plasma. The 9.3 x 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.
ISSN:2155-3165
DOI:10.1364/AO.47.005744