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| Titel |
Use of O2 airglow for calibrating direct atomic oxygen measurements from sounding rockets |
| VerfasserIn |
J. Hedin, J. Gumbel, J. Stegman, G. Witt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 2, no. 2 ; Nr. 2, no. 2 (2009-12-10), S.801-812 |
| Datensatznummer |
250000585
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| Publikation (Nr.) |
 copernicus.org/amt-2-801-2009.pdf |
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| Zusammenfassung |
| Accurate knowledge about the distribution of atomic oxygen is crucial for
many studies of the mesosphere and lower thermosphere. Direct measurements
of atomic oxygen by the resonance fluorescence technique at 130 nm have been
made from many sounding rocket payloads in the past. This measurement
technique yields atomic oxygen profiles with good sensitivity and altitude
resolution. However, accuracy is a problem as calibration and aerodynamics
make the quantitative analysis challenging. Most often, accuracies better
than a factor 2 are not to be expected from direct atomic oxygen
measurements. As an example, we present results from the NLTE (Non Local
Thermodynamic Equilibrium) sounding rocket campaign at Esrange, Sweden, in
1998, with simultaneous O2 airglow and O resonance fluorescence
measurements. O number densities are found to be consistent with the
nightglow analysis, but only within the uncertainty limits of the resonance
fluorescence technique. Based on these results, we here describe how better
atomic oxygen number densities can be obtained by calibrating direct
techniques with complementary airglow photometer measurements and detailed
aerodynamic analysis. Night-time direct O measurements can be complemented
by photometric detection of the O2 (b1∑g+−X3∑g-) Atmospheric Band at 762 nm,
while during daytime the O2 (a1Δg−X3∑g-) Infrared Atmospheric Band at 1.27 μm can be used. The
combination of a photometer and a rather simple resonance fluorescence probe
can provide atomic oxygen profiles with both good accuracy and good height
resolution. |
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