Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa52a..07s&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SA52A-07
Physics
2494 Instruments And Techniques, 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2443 Midlatitude Ionosphere
Scientific paper
The TIMED spacecraft is currently mapping the nighttime Earth disk and limb with the Global Ultraviolet Imager (GUVI). Images are made in the OI 135.6 nm line which is excited by the recombination of O+ ions. The intensity in these disk images is related to the total electron content of the ionosphere and density profiles can be recovered from the limb scans. Prominent in these images are UV signatures of the Equatorial Anomaly that was first imaged by the DE-1 satellite. Data is currently available from essentially the same local time and is suitable for the study of the longitudinal dependence of the Anomalies. It is known that the Earth's ionosphere shows the occurrence large longitudinal and latitudinal variations in the F-region plasma density that change with season and solar cycle. These plasma density fluctuations occur over a very large range of scale sizes and have been observed by for about three decades by satellites [e.g., ISIS 2, ESRO-4, Atmosphere Explorers, Dynamics Explorer-2, San Marco II, DMSP, etc.]. Their morphology, origin, day-to-day variability, and predictability are still not well understood. The GUVI night data that gives insight into these largest scale structures will be discussed.
Christensen Andrew B.
Craven John D.
Crowley Geoff
Meier Robert R.
Meng Ching I.
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