Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa43c..09y&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA43C-09
Other
[2411] Ionosphere / Electric Fields, [2415] Ionosphere / Equatorial Ionosphere, [2437] Ionosphere / Ionospheric Dynamics, [2439] Ionosphere / Ionospheric Irregularities
Scientific paper
The uneven distribution of ground-based instruments due to the large ocean coverage in the equatorial regions hinders our ability to obtain a global understanding of the dynamics and structure of the equatorial ionosphere. In Africa, which has been mostly devoid of ground-based instruments, the ionospheric density structure has been traditionally estimated by model interpolation over vast geographic areas. Recent ground- and space-based observations have shown that geomagnetic storms can have dramatic longitudinal differences in equatorial ionospheric electrodynamics, such as enhanced generation of F-region plasma irregularities, and super fountain effect at low latitudes. For example, satellite observations have shown very unique equatorial ionospheric density structures in the African region. The African region is the longitude sector where the occurrence of large scale bubble activity (zonal width, depletion level, and spacing) peaks. No other region in the globe shows similar characteristics. One of the possible driving mechanisms that govern the equatorial electrodynamics is the vertical ExB drift, which strongly affects the structure and dynamics of the ionosphere in the low/mid-latitude region. According to the observations performed at different longitudes, using recently deployed limited ground-based instruments, the vertical ExB drift has significant longitudinal differences. This paper presents initial results of vertical ExB drifts observed at three different longitudes: East African, West African, and West American sectors. The drift is estimated using a pairs of ground-based magnetometers technique. In the African sector stations from the AMBER, INTERMAGNET, and MAGDAS, and in the American sector SAMBA and LISN magnetometer arrays have been used for this study. Finally, the comparison between the magnetometer estimated ExB drift and the vertical drift observations (VEFI and IVM) on board C/NOFS satellites have also been performed, showing promising results.
Biouele C. M.
Damtie Baylie
Heelis Roderick A.
Mebrahtu Alem
Moldwin Mark
No associations
LandOfFree
The Longitudinal Variation of Equatorial Electrodynamics Observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Longitudinal Variation of Equatorial Electrodynamics Observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Longitudinal Variation of Equatorial Electrodynamics Observations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1505925