Multilayer mirrors and filters for imaging the earth's inner magnetosphere

Details Multilayer mirrors and filters for imaging the earth's inner magnetosphere Multilayer mirrors and filters for imaging the earth's inner magnetosphere

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1549..319s&link_type=abstract

Proc. SPIE Vol. 1549, p. 319-328, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy II, Oswald H. Siegmund; Richard E. Rot

Astronomy and Astrophysics

Astronomy

Scientific paper

Remote sensing of resonantly scattered 304 angstrom sunlight by He(superscript +) in the earth's plasmasphere would provide a structural map of the plasmasphere. The primary concern for such an imaging system is the extraction of the 304 angstrom signal out of a background of other wavelengths of much higher intensities. The capability of multilayer mirrors and thin film filters for this task are analyzed and some guidelines for the design of these optical elements for space imaging applications are presented. Analysis shows that multilayer mirrors require the use of a filter to remove longer wavelength background emissions and they do not provide uniform reflectance over the desired 30 deg field of view. An effective and simpler alternative for this application may be a Si coated Te transmission filter without multilayer mirrors.

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