Interference filter spectral imaging of twilight O+(P-2-D-2) emission

Physics

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Geomagnetism, Image Filters, Image Processing, Imaging Techniques, Nightglow, Oxygen Ions, Spectral Emission, Thermosphere, Twilight Glow, Calcium, Charge Coupled Devices, Focal Plane Devices

Scientific paper

A spectral imager specifically designed to measure the O(+)(P-2-D-2) emission in the thermosphere during twilight has been constructed and tested in Toronto (43.8 deg N, 79.3 deg W), and found to show promise for long-term and campaign-mode operations . A Modification of the mesopause oxygen rotational temperature imager (MORTI), it consists basically of a narrow-band interference filter (0.144 nm bandwidth) to separate wavelengths as a function of off-axis angle, a lens to focus the spectrum into a series of concentric rings, and a focal plane array (CCD) to record the spectral images in digital form. The instrument was built with two fields of view, one for the zenith and one for 20 deg above the horizon, moveable to track the azimuth of the Sun, in order to provide appropriate data for inversion. Data gathered during June 1991 provided measurments of the column-integrated emission rate with a precision of about 3%. An atomic oxygen profile was deducted that showed good agreement with that predicted by the MSIS-90 model atmosphere. Geomagnetically induced variations of the O(+) lines, calcium spectra resulting from meteor showers, and OH nightglow were also observed.

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