Comparison of the Equatorial Anomaly Development Mapped by TIMED/GUVI and Occurrence of Scintillations at low Latitudes

Details Comparison of the Equatorial Anomaly Development Mapped by TIMED/GUVI and Occurrence of Scintillations at low Latitudes Comparison of the Equatorial Anomaly Development Mapped by TIMED/GUVI and Occurrence of Scintillations at low Latitudes

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa43c..03b&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA43C-03

Statistics

2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities

Scientific paper

The GUVI instrument on NASA¡¦s TIMED satellite provides images of 135.6-nm emission in the Earth¡¦s ionosphere/thermosphere system. This emission arises from the radiative recombination of atomic oxygen and its brightness is approximately proportional to the square of the electron density. Thus, it acts as an excellent tracer for the dynamics of the crests in the F-region equatorial ionization anomaly. At dusk, longitudinal variations in the anomaly structure are easily seen in the GUVI data, as well as depletions in airglow caused by equatorial bubbles. Significant differences in the location and brightness of the anomaly crests can be seen on a day-to-day basis. Of particular interest is the equatorward collapse of the anomalies and the overall change in the asymmetries over the entire globe. The intensity and separation of these bands of increased electron density are controlled by the equatorial E×B drift and their relative asymmetry is a result of the meridional neutral wind. In this presentation, we provide global statistics of the anomaly collapse within the period January 2002 to June 2003 when GUVI orbits were in the local dusk time sector. We further choose two periods in February and April 2002 for a comparison of the GUVI equatorial anomaly behavior and scintillation characteristics at several low latitude stations.

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