GPS radio occultation measurements of the ionosphere from CHAMP: Early results

By Norbert Jakowski, A. Wehrenpfennig, S. Heise, C. Reigber, H. Lühr, L. Grunwaldt, T. Meehan. 2002

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Comparison of COSMIC ionospheric measurements with ground-based observations and model predictions : Preliminary results (2007, background): “The location of the tangential point at the F2 peak height hmF2 is defined as the site of an occultation event [Jakowski et al., 2002].”
A global climatology of ionospheric irregularities derived from GPS radio occultation (2008, background): “[6] Ionospheric RO data are usually 1 Hz sampled and cover the whole altitude range between the Low-Earth orbiting Satellite and about 60 km above surface [Jakowski et al., 2002; Tsybulya and Jakowski, 2005].”
The Radio Occultation Experiment aboard CHAMP: Operational Data Analysis and Validation of Vertical Atmospheric Profiles (2004, background): “These data products may be used to derive space weather information on the global state of the ionosphere (Jakowski et al., 2001, Wehrenpfennig et al., 2001).”
Motions of the equatorial ionization anomaly crests imaged by FORMOSAT‐3/COSMIC (2007, background): “Many studies have shown promised occultation results of ionospheric soundings in comparison with ground-based radar measurements since then [e.g., Hajj and Romans, 1998; Schreiner et al., 1999; Hernandez-Pajares et al., 2000; Hajj et al., 2000; Jakowski et al., 2002; Tsai and Tsai, 2004].”