F1-region studies of the ionosphere with Arecibo and an analysis of possible measurements with the AMISR

Details F1-region studies of the ionosphere with Arecibo and an analysis of possible measurements with the AMISR F1-region studies of the ionosphere with Arecibo and an analysis of possible measurements with the AMISR

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa33a0261s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA33A-0261

Physics

2400 Ionosphere (6929), 2419 Ion Chemistry And Composition (0335), 2443 Midlatitude Ionosphere, 2494 Instruments And Techniques

Scientific paper

The molecular ion composition in the F1 region is extremely difficult to measure with incoherent scatter radars because of the temperature/ion composition ambiguity in the shape of the incoherent scatter ion line spectrum. In practice this means that a non-linear least squares fitting analysis of IS ion line data in this region can find different combinations of ionospheric parameters to be equally good fits. The only way to mitigate this problem is to add additional information to reduce the number of unknown parameters that need to be determined by the non-linear least squares fitting. Following the concept originally reported by Waldteufel [1971], we have implemented a technique at Arecibo to combine the very precise electron density information in the plasma line with very accurate ion line spectra to measure the F1 region molecular ion composition. This involves using the electron density from plasma line measurements to get a measurement of the ratio of electron and ions temperatures independent of the shape of the ion line. We discuss the addition of further information, the electron temperature as derived from up/down plasma line measurements. In this study, we describe the technique and show the latest results from this method. We discuss how this technique can be applied and modified to meet the requirements of F1 region measurements with the AMISR system.

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