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| Titel |
Rocket observation of atomic oxygen and night airglow: Measurement of concentration with an improved resonance fluorescence technique |
| VerfasserIn |
K. Kita, T. Imamura, N. Iwagami, W. H. Morrow, T. Ogawa |
| 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 ; 14, no. 2 ; Nr. 14, no. 2, S.227-237 |
| Datensatznummer |
250012172
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| Publikation (Nr.) |
 copernicus.org/angeo-14-227-1996.pdf |
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| Zusammenfassung |
| An improved resonant fluorescence instrument
for measuring atomic oxygen concentration was developed to avoid the Doppler
effect and the aerodynamic shock effect due to the supersonic motion of a
rocket. The shock effect is reduced by adopting a sharp wedge-shaped housing and
by scanning of the detector field of view to change the distance between the
scattering volume and the surface of the housing. The scanning enables us to
determine absolute values of atomic oxygen concentration from relative variation
of the scattered light signal due to the self-absorption. The instrument was
calibrated in the laboratory, and the numerical simulation reproduced the
calibration result. Using the instrument, the altitude profile of atomic oxygen
concentration was observed by a rocket experiment at Uchinoura (31°N) on 28
January 1992. The data obtained from the rocket experiment were not perfectly
free from the shock effect, but errors due to the effect were reduced by the
data analysis procedure. The observed maximum concentration was 3.8× 1011
cm–3 at altitudes around 94 km. The systematic error is estimated to
be less than ±0.7×1011 cm–3 and the relative random
error is less than±0.07× 1011 cm–3at the same altitudes.
The altitude profile of the OI 557.7-nm airglow was also observed in the same
rocket experiment. The maximum volume emission rate was found to be 150 photons
cm–3 s–1 at 94 km. The observed altitude profiles are
compared with the MSIS model and other in situ observations. |
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