Crystal spectrometer studies of the sun employing a rotation modulation collimator

Physics

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Astronomical Photography, Collimators, Rocket-Borne Instruments, Solar Spectrometers, Solar X-Rays, X Ray Spectroscopy, Bragg Angle, Faculae, Microdensitometers, Photographic Recording, Point Sources, Solar Flares, Solar Spectra, Time Of Flight Spectrometers

Scientific paper

The use of rotating modulation collimators in high-resolution solar X-ray spectroscopy is discussed with reference to a sounding rocket carrying a modulation collimator and a Bragg crystal spectrometer to make moderately high-resolution spectral and spatial measurements simultaneously. The response of the instruments to extended sources is described. It is shown that the technique is particularly suited to long-term observations of active-region emission, but that useful measurements can be made even during a short rocket flight. A small flare commenced at about 0432 UT in McMath calcium plage region 12094; the emission from this provided the major contribution to the observed spectrum. X-ray emission from a group of active regions in the SW and the small McMath region 12090 has also been detected.

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