Wide-angle geocoronal telescope: a He-II 304-A plasmaspheric imager

Details Wide-angle geocoronal telescope: a He-II 304-A plasmaspheric imager Wide-angle geocoronal telescope: a He-II 304-A plasmaspheric imager

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993opten..32.3170c&link_type=abstract

Optical Engineering 32(12), 3170-3173, Brian J. Thompson; Ed.

Computer Science

Scientific paper

We describe the wide-angle geocoronal telescope (WIDGET). The telescope is designed to image resonantly scattered solar He-II 304-angstroms 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. WIDGET was designed so that it could easily be adapted to different wavelengths (584, 834, and 1216 angstroms) 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. It is designed for flight in October 1993.

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