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Optical Engineering

Wide-angle geocoronal telescope: a He-II 304-Å plasmaspheric imager
Author(s): Daniel M. Cotton; Robert A. Conant; Supriya Chakrabarti
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Paper Abstract

We describe the wide-angle geocoronal telescope (WIDGET). The telescope is designed to image resonantly scattered solar He-II 304-Å emission from the cold plasma constituent of the magnetosphere, the plasmasphere. It is a prime-focus telescope consisting of a spherical normal incidence f/2 mirror and a microchannel plate imaging detector. The instrument has a 30-deg field of view with a 0.5- to 1-deg angular resolution and a peak sensitivity of approximately 0.5 counts s-1 rayleigh-1 bin-1. The instrument was flown on a sounding rocket on 27 October 1992 to test its capabilities. Unfortunately, no useful data were recovered due to a failure in the low-voltage system. (It was scheduled for reflight in October 1993.) WIDGET was designed so that it could easily be adapted to different wavelengths (584, 834, and 1216Å) by means of suitable mirror coatings and filters. In this way, a series of WIDGETs could image different aspects of the inner magnetosphere simultaneously, thus providing a more unified picture of this complex region.

Paper Details

Date Published: 1 December 1993
PDF: 4 pages
Opt. Eng. 32(12) doi: 10.1117/12.155598
Published in: Optical Engineering Volume 32, Issue 12
Show Author Affiliations
Daniel M. Cotton, Boston Univ. (United States)
Robert A. Conant, Univ. of California/Berkeley (United States)
Supriya Chakrabarti, Boston Univ. (United States)


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