Determination of Density and Temperature at High Altitudes using Raleigh and Raman Scattering of Solar radiation

Details Determination of Density and Temperature at High Altitudes using Raleigh and Raman Scattering of Solar radiation Determination of Density and Temperature at High Altitudes using Raleigh and Raman Scattering of Solar radiation

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa12b1090s&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA12B-1090

Physics

0300 Atmospheric Composition And Structure

Scientific paper

The concept of determining the density (particles/unit volume) of atomic and molecular species at high altitudes (100-600 km) by passive remote sensing of the Raleigh and Raman limb-scattered solar radiation is explored. While both atoms and molecules contribute to Raleigh Scattering, only molecules normally contribute to Raman Scattering. Although the rotationally Raman Scattered component of the radiation is usually 20-40 times weaker than its Raleigh counterpart, the atomic and molecular contributions may be separated using different functional dependence of the two mechanisms on the scattering angle. Since the atmosphere at these altitudes is not well mixed, the dominant contributors to atomic (O, N, He, Ar) and molecular (nitrogen, oxygen) scattering may be further distinguished by their differing scale heights. The limb densities thus obtained will be used to calculate the filling in of a number of Fraunhofer lines (Ring effect) to derive the rotational temperatures of the molecular species. Finally, Abel inversions will be carried out to obtain the density and temperature profiles as functions of altitude.

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