منابع مشابه
Far Ultraviolet Detector Standards
National Bureau of Standards Gaithersburg, MD 20899 A description is given of the NBS program in which special photodiodes for the far ultraviolet spectral region (5254 nm) are made available as transfer standards. These detectors are calibrated in terms of quantum efficiency (photoelectrons per incident photon) as a function of wavelength. Descriptions are also given of the calibration princip...
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Thermal and chemical evolution of primordial gas clouds irradiated with farultraviolet (FUV; hν < 13.6 eV) radiation is investigated. In clouds irradiated by intense FUV radiation, sufficient hydrogen molecules to be important for cooling are never formed. However, even without molecular hydrogen, if the clouds are massive enough, they start collapsing via atomic hydrogen line cooling. Such clo...
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Ten years ago transient decreases in Earth's far−ultraviolet dayglow were reported for global images acquired with the high−altitude, polar−orbiting spacecraft Dynamics Explorer 1. These decreases were observed primarily in the atomic oxygen emissions at 130.4 nm. The diameters of these dark spots, or "atmospheric holes", were in the range of 50 to 100 km. Recently a sophisticated camera for im...
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ژورنال
عنوان ژورنال: Journal of Research of the National Bureau of Standards
سال: 1987
ISSN: 0160-1741
DOI: 10.6028/jres.092.011