Design and fabrication of the all-reflecting H-Lyman alpha coronagraph/polarimeter

Richard B. Hoover; R. Barry Johnson; Silvano Fineschi; Arthur B. C. Walker II; Phillip C. Baker; Muamer Zukic; Jongmin Kim

doi:10.1117/12.140577

21 January 1993 Design and fabrication of the all-reflecting H-Lyman α coronagraph/polarimeter

Richard B. Hoover, R. Barry Johnson, Silvano Fineschi, Arthur B. C. Walker II, Phillip C. Baker, Muamer Zukic, Jongmin Kim

Author Affiliations +

Proceedings Volume 1742, Multilayer and Grazing Incidence X-Ray/EUV Optics for Astronomy and Projection Lithography; (1993) https://doi.org/10.1117/12.140577
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

We have designed, analyzed, and are now fabricating an All-Reflecting H-Lyman-alpha Coronagraph/Polarimeter for solar research. This new instrument operates in a narrow bandpass centered at 215.7 A - the neutral hydrogen Ly-alpha line. It is shorter and faster than the telescope which produced solar Ly-alpha images as a part of the MSSTA payload that was launched on May 13, 1991. The Ly-alpha line is produced and linearly polarized in the solar corona by resonance scattering, and the presence of a magnetic field modifies this polarization according to the Hanle effect. The Lyman-alpha Coronagraph/Polarimeter instrument has been designed to measure coronal magnetic fields by interpreting, via the Hanle effect, the measured linear polarization of the coronal Ly-alpha line. Ultrasmooth mirrors, polarizers, and filters are being flow-polished for this instrument from CVD silicon carbide substrates. These optical components will be coated using advanced induced transmission and absorption thin film multilayer coatings to optimize the reflectivity and polarization properties at 1215.7 A. We describe some of the solar imaging results obtained with the MSSTA Lyman-alpha coronagraph. We also discuss the optical design parameters and fabrication plans for the All-Reflecting H-Lyman-alpha Coronagraph/Polarimeter.

Citation Download Citation

Richard B. Hoover, R. Barry Johnson, Silvano Fineschi, Arthur B. C. Walker II, Phillip C. Baker, Muamer Zukic, and Jongmin Kim "Design and fabrication of the all-reflecting H-Lyman α coronagraph/polarimeter", Proc. SPIE 1742, Multilayer and Grazing Incidence X-Ray/EUV Optics for Astronomy and Projection Lithography, (21 January 1993); https://doi.org/10.1117/12.140577

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