Abstract

This study consists of the quantitative observation of the distribution of harmonic components of scintillation with frequency. Examples of preliminary results at frequencies ranging from 10 to 800 cycles per second are used to exhibit changes in this frequency distribution with visual seeing, zenith distance of the observed object, altitude above sea level, size of circular aperture, and orientation of rectangular aperture. Motion pictures of shadows on a 40-inch mirror caused by atmospheric disturbances which produce scintillation indicate that these shadows have a transitory nature. Motion pictures of Hartmann images demonstrate changes of size, shape, and brightness (scintillation) of stellar images formed as light from the same star passes through four widely-separated apertures in front of the 40-inch mirror. Color scintillation is demonstrated with tracings from a dual-beam oscillograph. Other tracings show that scintillating starlight is not polarized.

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