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Observing the solar corona with a tunable Fabry-Perot filter

Noble, Matthew W. and Rust, David M. and Bernasconi, Pietro N. and Pasachoff, Jay M. and Babcock, Bryce A. and Bruck, Megan A. (2008) Observing the solar corona with a tunable Fabry-Perot filter. Applied Optics, 47 (31). pp. 5744-5749. ISSN 0003-6935.

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A solid Fabry-Perot etalon with a 0.16 Å 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 Å V^−1. During the eclipse, 18 filtergrams were obtained at six 0.22 Å steps across the profile of the forbidden [Fe X] spectral emission line at 6374.4 Å, 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.

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Pasachoff, Jay M.0000-0002-4372-4928
Additional Information:© 2008 Optical Society of America. Received 22 July 2008; accepted 24 August 2008; posted 5 September 2008 (Doc. ID 99216); published 21 October 2008. The expedition was partly supported by grant ATM-0552116 from the Solar Terrestrial Research Program of the U.S. National Science Foundation’s (NSF’s) Division of Atmospheric Sciences, the Committee for Research and Exploration of the National Geographic Society, NASA's Planetary Astronomy Division for the CCD cameras (NNG04GE48G), Sigma Xi, and the Rob Spring Fund and the Ryan Patrick Gaishin Fund at Williams College. We thank Steven P. Souza and John Seiradakis for their assistance.
Funding AgencyGrant Number
National Science FoundationATM-0552116
National Geographic SocietyUNSPECIFIED
Rob Spring Fund, Williams CollegeUNSPECIFIED
Ryan Patrick Gaishin Fund, Williams CollegeUNSPECIFIED
Issue or Number:31
Record Number:CaltechAUTHORS:NOBao08
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Official Citation:M. W. Noble, D. M. Rust, P. N. Bernasconi, J. M. Pasachoff, B. A. Babcock, and M. A. Bruck, "Observing the solar corona with a tunable Fabry-Perot filter," Appl. Opt. 47, 5744-5749 (2008)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12564
Deposited By: Archive Administrator
Deposited On:12 Dec 2008 23:21
Last Modified:09 Mar 2020 13:19

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