Improving the Abel transform inversion using bending angles from FORMOSAT-3/COSMIC |
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Authors: | Angela Aragon-Angel Manuel Hernandez-Pajares J Miguel Juan Zornoza Jaume Sanz Subirana |
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Institution: | (1) Research Group of Astronomy and Geomatics, Technical University of Catalonia, Module C3, Room 210, 08034 Barcelona, Spain |
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Abstract: | The FORMOSAT-3/COSMIC satellite constellation has become an important tool toward providing global remote sensing data for
sounding of the atmosphere of the earth and the ionosphere in particular. In this study, the electron density profiles are
derived using the Abel transform inversion. Some drawbacks of this transform in LEO GPS sounding can be overcome by considering
the separability concept: horizontal gradients of vertical total electron content (VTEC) information are incorporated by the
inversion method, providing more accurate electron density determinations. The novelty presented in this paper with respect
to previous works is the use of the phase change between the GPS transmitter and the LEO receiver as the main observable instead
of the ionospheric combination of carrier phase observables for the implementation of separability in the inversion process.
Some of the characteristics of the method when applied to the excess phase are discussed. The results obtained show the equivalence
of both approaches but the method exposed in this work has the potentiality to be applied to the neutral atmosphere. Recent
FORMOSAT-3/COSMIC data have been processed with both the classical Abel inversion and the separability approach and evaluated
versus colocated ionosonde data. |
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Keywords: | |
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