Direct observation of Space Shuttle water vapour exhaust plumes by Odin/SMR

Details Direct observation of Space Shuttle water vapour exhaust plumes by Odin/SMR Direct observation of Space Shuttle water vapour exhaust plumes by Odin/SMR

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa32a..07l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA32A-07

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[0300] Atmospheric Composition And Structure, [3369] Atmospheric Processes / Thermospheric Dynamics

Scientific paper

Odin/SMR measurements of the strong 557 GHz emission line of water vapour allow the retrieval of this species even at altitudes in the upper mesosphere and lower thermosphere. Typically the signal-to-noise ratio is poor at altitudes above 100 km and averaging is required to get sensible results at these altitudes. However the extraordinary concentrations inside the Space Shuttle exhaust plumes allow the retrieval of single water profiles with good statistics also at altitudes above 100 km. Since the start of the Odin mission 2001 in total 60 plume signatures could be detected after 8 Space Shuttle launches, even if Odin/SMR measurements of the 557 GHz band are performed only with larger time intervals. Plumes signatures were observed between a half day to more than two days after the Space Shuttle launch, reaching as far as to 75°N. The plume peak values are typically observed between 95 km and 105 km with concentrations of a couple of ppmv, i.e. roughly a factor 50 was is normally observed. These values describe an average over ~400 km (length) x 4 km (width) x 4 km (height) at the tangent altitude, indicating that the concentrations in the plume peak region are much higher.

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