Retrieval of mesospheric electron densities using an optimal estimation inverse method

Details Retrieval of mesospheric electron densities using an optimal estimation inverse method Retrieval of mesospheric electron densities using an optimal estimation inverse method

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..381g&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 5, p. 381-392.

Physics

Radar, Partial Reflections, Mesosphere, Electron Density, Optimal Estimation Retrieval

Scientific paper

We present a new method to determine mesospheric electron densities from partially reflected medium frequency radar pulses. The technique uses an optimal estimation inverse method and retrieves both an electron density profile and a gradient electron density profile. As well as accounting for the absorption of the two magnetoionic modes formed by ionospheric birefringence of each radar pulse, the forward model of the retrieval parameterises possible Fresnel scatter of each mode by fine electronic structure, phase changes of each mode due to Faraday rotation and the dependence of the amplitudes of the backscattered modes upon pulse width. Validation results indicate that known profiles can be retrieved and that χ2 tests upon retrieval parameters satisfy validity criteria. Application to measurements shows that retrieved electron density profiles are consistent with accepted ideas about seasonal variability of electron densities and their dependence upon nitric oxide production and transport.

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