Preparing for COSMIC: Inversion and Analysis of Ionospheric Data Products

Syndergaard, Stig; Schreiner, William S.; Rocken, Christian; Hunt, Douglas; Dymond, K. F.

doi:10.1007/3-540-34121-8_12

Cited by 53 publications

(59 citation statements)

References 13 publications

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“…The retrieval of electron density profiles from RO observations is described by Leitinger et al (1997), Schreiner et al (1999), Syndergaard et al (2006), and Lei et al (2007). Lei et al (2007) show some of the first comparisons made between COSMIC-derived electron density profiles and those measured by Incoherent Scatter Radars (ISR) at Millstone Hill and Jicamarca.…”

Section: Ionospheric Research and Space Weathermentioning

confidence: 99%

Exploring Earth's atmosphere with radio occultation: contributions to weather, climate and space weather

2011

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Abstract. The launch of the proof-of-concept mission GPS/MET (Global Positioning System/Meteorology) in 1995 began a revolution in profiling Earth's atmosphere through radio occultation (RO). GPS/MET; subsequent single-satellite missions CHAMP (CHAllenging Minisatellite Payload), SAC-C (Satellite de Aplicaciones Cientificas-C), GRACE (Gravity Recovery and Climate Experiment), METOP-A, and TerraSAR-X (Beyerle et al., 2010); and the six-satellite constellation, FORMOSAT-3/COSMIC (Formosa Satellite mission #3/Constellation Observing System for Meteorology, Ionosphere, and Climate) have proven the theoretical capabilities of RO to provide accurate and precise profiles of electron density in the ionosphere and refractivity, containing information on temperature and water vapor, in the stratosphere and troposphere. This paper summarizes results from these RO missions and the applications of RO observations to atmospheric research and operational weather analysis and prediction.

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Section: Ionospheric Research and Space Weathermentioning

confidence: 99%

Exploring Earth's atmosphere with radio occultation: contributions to weather, climate and space weather

2011

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“…At CDAAC, the ionospheric profiles are also retrieved by the Abel inversion from TEC along LEO-GPS rays. Detailed description of CDAAC data processing and the Ne profile retrieval method can be found in Kuo et al (2004) and Syndergaard et al (2006). The error sources of Ne profiles derived from RO measurements mainly include the assumptions made in the inversion method and the measurement errors.…”

Section: Cosmic Datamentioning

confidence: 99%

Ionospheric electron density observed by FORMOSAT-3/COSMIC over the European region and validated by ionosonde data

Krankowski

Zakharenkova

Krypiak-Gregorczyk

et al. 2011

J Geod

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This research is motivated by the recent IGS Ionosphere Working Group recommendation issued at the IGS 2010 Workshop held in Newcastle, UK. This recommendation encourages studies on the evaluation of the application of COSMIC radio occultation profiles for additional IGS global ionosphere map (GIM) validation. This is because the reliability of GIMs is crucial to many geodetic applications. On the other hand, radio occultation using GPS signals has been proven to be a promising technique to retrieve accurate profiles of the ionospheric electron density with high vertical resolution on a global scale. However, systematic validation work is still needed before using this powerful technique for sounding the ionosphere on a routine basis. In this paper, we analyze the properties of the ionospheric electron density profiling retrieved from COSMIC radio occultation measurements. A comparison of radio occultation data with groundbased measurements indicates that COSMIC profiles are usually in good agreement with ionosonde profiles, both in the F2 layer peak electron density and the bottom side of the profiles. For this comparison, ionograms recorded by European ionospheric stations (DIAS network) in 2008 were used.

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“…At the COSMIC Data Analysis and Archive Center (CDAAC) of the University Corporation for Atmospheric Research (UCAR), EDPs are retrieved by the Abel inversion from TEC along the LEO-GPS ray. Detailed descriptions of CDAAC data processing and the EDP retrieval method can be found in Kuo et al (2004), Lei et al (2007), Schreiner et al (1999), and Syndergaard et al (2006). These EDPs have been validated by comparing with ground-based Ionosonde and Incoherent Scatter Radar (ISR) observations (e.g., Lei et al, 2007;Kelley et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Error analysis of Abel retrieved electron density profiles from radio occultation measurements

et al. 2010

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Abstract. This letter reports for the first time the simulated error distribution of radio occultation (RO) electron density profiles (EDPs) from the Abel inversion in a systematic way. Occultation events observed by the COSMIC satellites are simulated during the spring equinox of 2008 by calculating the integrated total electron content (TEC) along the COS-MIC occultation paths with the "true" electron density from an empirical model. The retrieval errors are computed by comparing the retrieved EDPs with the "true" EDPs. The results show that the retrieved NmF2 and hmF2 are generally in good agreement with the true values, but the reliability of the retrieved electron density degrades in low latitude regions and at low altitudes. Specifically, the Abel retrieval method overestimates electron density to the north and south of the crests of the equatorial ionization anomaly (EIA), and introduces artificial plasma caves underneath the EIA crests. At lower altitudes (E-and F1-regions), it results in three pseudo peaks in daytime electron densities along the magnetic latitude and a pseudo trough in nighttime equatorial electron densities.

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Preparing for COSMIC: Inversion and Analysis of Ionospheric Data Products

Cited by 53 publications

References 13 publications

Exploring Earth's atmosphere with radio occultation: contributions to weather, climate and space weather

Exploring Earth's atmosphere with radio occultation: contributions to weather, climate and space weather

Ionospheric electron density observed by FORMOSAT-3/COSMIC over the European region and validated by ionosonde data

Error analysis of Abel retrieved electron density profiles from radio occultation measurements

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