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1 June 1992 WIDe-angle GEocoronal Telescope (WIDGET)
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We describe the WIDe-angle GEocoronal Telescope or WIDGET. The telescope is designed to image the cold plasma constituent of the magnetosphere, the plasmasphere, by imaging the He II 304 angstroms emission. It utilizes a spherical normal incidence f/2 mirror with a microchannel plate imaging detector positioned near the focal point of the mirror. The instrument has a 30 degree(s) field of view with a .5 - 1 degree(s) angular resolution. The mirror has a multilayer coating which, combined with an Al/C filter and the detector response, provides a peak sensitivity of approximately 0.5 ct/sec/Rayleigh/bin at 304 angstroms with a bandpass of about 60 angstroms. The instrument will be flown on a sounding rocket in the Fall of 1992 as a test of its capabilities. It can easily be adapted to different wavelengths (584, 834, and 1216 angstroms) using 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.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Daniel M. Cotton, Robert A. Conant, and Supriya Chakrabarti "WIDe-angle GEocoronal Telescope (WIDGET)", Proc. SPIE 1744, Instrumentation for Magnetospheric Imagery, (1 June 1992);


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