Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa43c..03r&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA43C-03
Other
[2415] Ionosphere / Equatorial Ionosphere
Scientific paper
The occurrence of radio scintillation from ionospheric plasma density irregularities is sensitively dependent on nighttime plasma drifts and thus the electrodynamics of the ionospheric locale. Several recent observations of scintillation phenomena over Africa provide opportunities and challenges for our understanding of the processes that lead to the phenomenon: 1) It is interesting for this session to note that C/NOFS observations from the recent solar minimum found a higher frequency of scintillation over Africa than other regions. 2) The timing of the 3 August 2010 geomagnetic storm placed the most favorable location for penetration electric fields over Africa, and out-of-season scintillation was subsequently observed at Ascension Island and other African and near-African SCINDA stations. These quiet-time and active-time observations will be discussed in the context of modeling of the phenomena with PBMOD, the low-latitude ionosphere prediction model developed for the C/NOFS program, with the aim of identifying the electrodynamic drivers needed to reproduce and explain the scintillation observations.
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