2,297 research outputs found
A geostationary imaging spectrometer TOMS instrument
One design for a geostationary Total Ozone Mapping Spectrometer (TOMS) with many desirable features is an imaging spectrometer. A preliminary study makes use of a 0.25 m Czerny-Turner spectrometer with which the Earth is imaged on a charge-coupled device (CCD) in dispersed light. The wavelength is determined by a movable grating which can be set arbitrarily by ground control. The signal integration time depends on wavelength but this system allows arbitrary timing by command. Special circumstances such as a requirement to track a low-lying sulfur dioxide cloud or a need to discriminate high level ozone from total ozone at midlatitudes could be obtained by adding a particular wavelength to the normally pre-programmed time sequence. The incident solar irradiance is measured by deploying a diffuser plate in the field of view. Individual detector elements correspond to scene elements in which the several wavelengths are serially sampled and the Earth radiance is compared to the incident sunlight. Thus the problem of uncorrelated drift of multiple detectors is removed
The Proposed 1972 Constitution for the State of Montana
This paid advertising supplement includes the text of the proposed 1972 constitution for the State of Montana as well as introduction and an article-by-article analysis. The supplement was distributed in several Montana newspapers.https://scholarworks.umt.edu/montanaconstitution/1047/thumbnail.jp
Nematode communities, plant nutrient economy and life-cycle characteristics jointly determine plant monoculture performance over 12 years
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