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Observing the solar corona with a tunable Fabry-Perot filter  

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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OBSERVATIONAL EVIDENCE OF THE KINK INSTABILITY IN SOLAR FILAMENT ERUPTIONS AND SIGMOIDS  

David Rust   Submitted: 2005-02-07 07:43

Two lines of observational evidence are used to infer that the MHD helical kink instability is associated with solar eruptions. The sense of twist and writhe are determined in images of 7 erupting filaments obtained at 10830 , 1600 , 195 and 171 . In every case the sense of twist is the same as the sense of writhe, as required for a kink. From images in the soft X-ray and EUV spectrum, measurements of the height/width ratio of 623 sigmoids show a mean value of 5.47, which is the ratio expected for kinked flux ropes.

Authors: Rust, D.M., and LaBonte, B.J.
Projects: None

Publication Status: ApJ. Letts. (in press)
Last Modified: 2005-02-07 07:43
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Observing the solar corona with a tunable Fabry-Perot filter
OBSERVATIONAL EVIDENCE OF THE KINK INSTABILITY IN SOLAR FILAMENT ERUPTIONS AND SIGMOIDS

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