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Using IRI for the computation of ionospheric corrections for altimeter data analysisMeasurements by single-frequency satellite altimeter (Geosat, ERS-1) require a ionospheric correction to account for the signal time delay in the ionosphere. We propose using the International Reference Ionosphere (IRI) for the determination of this time delay. To investigate the effectiveness of an IRI correction, we have compared the IRI values with ionospheric corrections deduce from measurements by the dual-frequency Topex altimeter. By measuring at two frequencies, the Topex instrument can record (and thus eliminate) the ionospheric influence. We find that IRI agrees with the Topex data much better than the model that is currently used in Geosat data analysis. In particular the earlier model does not represent the equatorial double-peak (equator anomaly) clearly seen in the Topex data. Overall, the use of IRI results in a 30% improvement (over the older model) in the accuracy of ionospheric corrections computed for the first year of the Topex mission.
Document ID
19950035350
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bilitza, D.
(Hughes STX, Greenbelt, MD US, United States)
Koblinsky, C.
(NASA Goddard Space Flight Center Greenbelt, MD, US, United States)
Beckley, B.
(Hughes STX, Greenbelt, MD US, United States)
Zia, S.
(Hughes STX, Greenbelt, MD US, United States)
Williamson, R.
(Hughes STX, Greenbelt, MD US, United States)
Date Acquired
August 16, 2013
Publication Date
February 1, 1995
Publication Information
Publication: Advances in Space Research
Volume: 15
Issue: 2
ISSN: 0273-1177
Subject Category
Geophysics
Accession Number
95A66949
Distribution Limits
Public
Copyright
Other

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