Comparison of FORMOSAT-3/COSMIC radio occultation measurements with radio tomography
Article first published online: 26 MAY 2011
Copyright 2011 by the American Geophysical Union.
Volume 46, Issue 3, June 2011
How to Cite
2011), Comparison of FORMOSAT-3/COSMIC radio occultation measurements with radio tomography, Radio Sci., 46, RS3001, doi:10.1029/2010RS004431., , , and (
- Issue published online: 26 MAY 2011
- Article first published online: 26 MAY 2011
- Manuscript Accepted: 3 MAR 2011
- Manuscript Revised: 24 FEB 2011
- Manuscript Received: 15 MAY 2010
- radio occultation;
- midlatitude ionosphere;
- GNU radio beacon receiver
 The paper reports a comparison between the continuous tomographic observations of the ionosphere during July–August 2008 and radio occultation (RO) measurements made by the Formosa Satellite 3/Constellation Observing System for Meteorology, Ionosphere, and Climate (FORMOSAT-3/COSMIC or F3/C). The two sets of observations agree well qualitatively and bring out the main features of the low-latitude to midlatitude ionosphere: (1) The electron density enhancements observed at ∼26°N–31°N geographic (∼16°N–21°N magnetic) latitudes during daytime are related to the equatorial ionization anomaly (EIA), and (2) the enhancements observed at night at latitudes poleward of ∼35°N geographic are related to the midlatitude summer nighttime anomaly. The comparison shows that the EIA crest densities are highly underestimated in the RO inversions that use F3/C data. It is also seen that the agreement is better in the midlatitude region, with overall features represented quite well in the RO data, highlighting its usefulness as the two techniques capture similar electron density structure, although there are some magnitude differences.