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| Paper: |
CIV Vacuum Ultraviolet Fabry-Perot Interferometers for Transition-Region Magnetography |
| Volume: |
358, Solar Polarization 4 |
| Page: |
181 |
| Authors: |
Gary, G.A.; West, E.A.; Rees, D.E.; Zukic, M.; Herman, P.; Li, J. |
| Abstract: |
The vacuum ultraviolet region allows remote sensing of the upper levels of the solar atmosphere where the magnetic field dominates the physics. Obtaining an imaging interferometer that observes the transition region is the goal of this program. This paper gives a summary of our instrument development program (1998–2005) for a high-spectral-resolution, piezoelectric tunable Vacuum Ultraviolet Fabry-Perot Interferometer (VUV FPI) for obtaining narrow-passband images, magnetograms, and Dopplergrams of the transition region emission line of C IV (155 nm). A VUV interferometer will allow us to observe the magnetic field, flows, and heating events in the mid-transition region. The MSFC VUV FPI has measured values of FWHM ∼ 9 pm, FSR ∼ 62 pm, finesse ∼ 5.3, and transmittance ∼ 50% at 157 nm. For the measurements, the University of Toronto's F2 eximer laser was used as an appropriate proxy for C IV 155 nm. This has provided the first tunable interferometer with a FWHM compatible to VUV filter magnetograph. |
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