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Optical Engineering

Optical design of a near-ultraviolet coronagraph for a sounding rocket platform
Author(s): Clarence M. Korendyke; Dianne K. Prinz; Dennis George Socker
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Paper Abstract

The near-UV (190 to 270 nm) coronal emission lines present a unique opportunity to observe heliospheric plasmas between one and two solar radii. The near-UV coronagraph was specifically designed to obtain observations in these lines from a sounding rocket platform. The design demonstrates that high-resolution, two-dimensional coronal observations in the near-UV are readily achievable within the practical constraints of a sounding rocket. The near-UV coronagraph consists of a reflective, coronagraph telescope followed by an imaging channeled spectrograph. The telescope includes a Lyot stop and an occulter to minimize instrumentally scattered disk radiation. The choice of a mirror objective gives rise to a compact, achromatic telescope with excellent off-axis rejection and good imaging properties. The focal plane package combines a Fabry-Pérot interferometer with a tandem Wadsworth spectrograph to produce a channeled spectrum consisting of a series of two-dimensional (25 x 500 arcsec), narrow-bandpass (~0.1 Å) images at the instrument focal plane. The instrument will produce a number of high-spatial-resolution (< 1 arcsec) coronal images in a single flight.

Paper Details

Date Published: 1 February 1994
PDF: 5 pages
Opt. Eng. 33(2) doi: 10.1117/12.152194
Published in: Optical Engineering Volume 33, Issue 2
Show Author Affiliations
Clarence M. Korendyke, Naval Research Lab. (United States)
Dianne K. Prinz, Naval Research Lab. (United States)
Dennis George Socker, Naval Research Lab. (United States)


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