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| Titel |
Interference filter spectral imaging of twilight O+(2P-2D) emission |
| VerfasserIn |
Y. Ma, R. N. Peterson, S. P. Zhang, I. C. McDade, R. H. Wiens, G. G. Shepherd |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 13, no. 2 ; Nr. 13, no. 2, S.189-194 |
| Datensatznummer |
250011748
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| Publikation (Nr.) |
 copernicus.org/angeo-13-189-1995.pdf |
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| Zusammenfassung |
| A spectral imager specifically designed to
measure the O+(2P-2D) emission in the
thermosphere during twilight has been constructed and tested in Toronto (43.8°N,
79.3°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 (0.14 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° above the horizon, movable
to track the azimuth of the Sun, in order to provide appropriate data for
inversion. Data gathered during June 1991 provided measurements of the
column-integrated emission rate with a precision of about 3%. An atomic oxygen
profile was deduced 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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