Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa41b0436h&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA41B-0436
Physics
2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities, 2494 Instruments And Techniques
Scientific paper
The TIMED spacecraft is currently mapping the Earth disk and limb with the Global Ultraviolet Imager (GUVI). Images are made at six different wavelengths including the optically thin OI 135.6 nm line that is excited by the recombination of O+ ions at night. The intensity in these nighttime 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 (EA) where Equatorial Plasma Bubbles (EPBs) can be seen. We present a method to detect EPBs in GUVI data based upon image subspace techniques. We then present EPB detection rates in the entire 2002 GUVI dataset. Observations are made about rate dependencies to season, zone, local time, and the general condition of the EA. Finally, these results are compared with similar in situ based observations.
Avery S.
Christensen A.
Craven J.
Crowley Geoff
Henderson Samuel S.
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