Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3859f&link_type=abstract
HST Proposal ID #3859
Other
Hst Proposal Id #3859 Solar System
Scientific paper
We propose to make the first nighttime measurements of nitric oxide in the earth's lower thermosphere. Nitric oxide is an important constituent of the earth's upper atmosphere but has been poorly observed. The GHRS on the HST provides an extremely simple and efficient way to measure UV absorption bands of NO using B and/or O stars acquired by the GHRS for other GO/GTO investigations. Several minutes before the target is occulted by the earth, we request a change of grating to obtain NO altitude profiles. The only time requested for this project is the last few minutes before earth occultation, a period when the instrument would otherwise be idle. Atmospheric models have demonstrated that NO in the 80-120 km region is quite sensitive to vertical transport, especially at night. The transport is typically parameterized by the eddy diffusion coefficient which is poorly known. The unique HST measurements would test and refine our knowledge of the earth's upper atmospheric diffusion processes. Once the technique is attempted and tested, it would be relatively easy for STScI to perform these observations routinely, disposing them to the archives for use by any interested scientist. This is a cheap, easy way to monitor the earth's atmosphere which should be exploited.
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