Instrument for the monochromatic observation of all sky auroral images

Details Instrument for the monochromatic observation of all sky auroral images Instrument for the monochromatic observation of all sky auroral images

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apopt..16.1691m&link_type=abstract

Applied Optics, vol. 16, June 1977, p. 1691-1700. Research supported by the Lockheed Independent Research Program

Physics

Optics

7

All Sky Photography, Auroral Spectroscopy, Electrophotometers, Imaging Techniques, Monochromatic Radiation, Television Cameras, Atmospheric Radiation, Chronophotography, Earth Ionosphere, Earth Magnetosphere, Light Amplifiers, Upper Atmosphere

Scientific paper

To investigate the dynamics of auroras and faint upper atmospheric emissions, a new type of imaging instrument was developed. The instrument is a wide field of view, narrow-spectral-band imaging system using an intensified S.E.C. TV camera in a time exposure mode. Pictures were taken at very low light levels of a few photons per exposure per resolution element. These pictures are displayed in the form of a pseudocolor presentation in which the color represents spectral ratios of two of the observed auroral spectral emission features. The spectral ratios play an important part in the interpretation of auroral particle dynamics. A digital picture processing facility is also part of the system which enables the digital manipulation of the pictures of standard TV rates. As an example, hydrogen auroras can be displayed having been corrected for nonspectral background by subtracting a picture obtained by a suitable background filter. The instrumentation was calibrated in the laboratory and was used in several field experiments. Elaborate exposure sequences were developed to extend the dynamic range and to cover the large range of auroral brightness in a fairly linear manner.

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