Journal cover Journal topic
Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 20, 1253-1256, 2002
https://doi.org/10.5194/angeo-20-1253-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
31 Aug 2002
Letter to the Editor
Abel transform inversion of radio occultation measurements made with a receiver inside the Earth’s atmosphere
S. B. Healy1, J. Haase3,2, and O. Lesne2 1Met office, Bracknell, UK
2ACRI-ST, Sophia-Antipolis, France
3Purdue University, Department of Earth and Atmospheric Sciences, West Lafayette, USA
Correspondence to: S. B. Healy
(sean.healy@metoffice.com)
Abstract. Radio occultation measurements made with a receiver inside the Earth’s atmosphere can be inverted, assuming local spherical symmetry, with an Abel transform to provide an estimate of the atmospheric refractive index profile. The measurement geometry is closely related to problems encountered when inverting seismic time-travel data and solar occultation measurements, where the Abel solution is well known. The method requires measuring both rays that originate from above and below the local horizon of the receiver. The Abel transform operates on a profile of "partial bending angles" found by subtracting the positive elevation measurement from the negative elevation value with the same impact parameter. In principle, the refractive index profile can be derived from measurements with a single frequency GPS receiver because the ionospheric bending is removed when the partial bending angle is evaluated.

Key words. Atmospheric composition and structure (pressure, density and temperature) – Radio science (remote sensing)


Citation: Healy, S. B., Haase, J., and Lesne, O.: Letter to the Editor
Abel transform inversion of radio occultation measurements made with a receiver inside the Earth’s atmosphere, Ann. Geophys., 20, 1253-1256, https://doi.org/10.5194/angeo-20-1253-2002, 2002.
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