Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21b0460k&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SA21B-0460
Physics
2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities
Scientific paper
The Global Ultraviolet Imager (GUVI) on NASA's Thermosphere Ionosphere and Mesosphere Energetics and Dynamics (TIMED) detected dark features mostly extended in the north-south directions in the low-latitude region. Comparisons of the GUVI images with the radar observations at Sao Luis in Brazil indicated that the occurrence of the dark features were closely related to the development of plumes to higher altitudes. The coincidence observations of the plasma density from the ROCSAT and DMSP satellites further verified that they were produced by the plasma bubbles. The bubble signatures were most pronounced near the equatorial ionization anomalies owing to the bright background. The dark features were mostly tilted westward and, occasionally, a whole arch shaped depletion layer was observed on one orbit. GUVI images showed first time the global view of the westward tilt of the plasma bubbles, which supports the presence of the vertical shear, i.e., an increase of the zonal plasma drift velocity with altitude in the topside ionosphere.
Avery Susan K.
Christensen Andrew B.
Craven John D.
Crowley Geoff
Kil Hyosub
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