The relationship between TIMED/GUVI and Global GPS-TEC measurements in the equatorial ionization anomaly region

Details The relationship between TIMED/GUVI and Global GPS-TEC measurements in the equatorial ionization anomaly region The relationship between TIMED/GUVI and Global GPS-TEC measurements in the equatorial ionization anomaly region

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa23a..07h&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA23A-07

Physics

0310 Airglow And Aurora, 2415 Equatorial Ionosphere

Scientific paper

The Global Ultraviolet Imager (GUVI) onboard NASA TIMED spacecraft is currently mapping ionospheric radiation at five different wavelengths. The GUVI image from OI 135.6 nm emission shows clear signatures of the equatorial ionization anomaly (EIA). To analyze the relationship between the intensity of the ion emission and total electron content (TEC), the GUVI observed global EIA structures are compared with the Global Ionospheric TEC map derived from global GPS network during 2002-2004. We compare the peak density/intensity of the EIA peak observed by both GUVI disk radiance data and GPS-TEC. Results show that the GUVI radiances have a linear relationship to the GPS-TEC but the slope of the linear relationship shows seasonal variation. We have also compared the GUVI radiances to the IRI electron density profiles and the MSIS composition information. We find that they also show a string correlation with the GUVI observations. The linear relationship between the GUVI radiance and GPS-TEC shows that the GUVI image data provide additional information of the EIA peak, which can be then implemented in constructing the global ionospheric TEC information in assimilative models (such as GAIM) especially at locations where no ground based GPS receiver is available.

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