Mathematics – Logic
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa42a..03r&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA42A-03
Mathematics
Logic
[2415] Ionosphere / Equatorial Ionosphere
Scientific paper
The goal of the C/NOFS (Communication and Navigation Outage Forecast System) project is to further our understanding of the processes in the low-latitude ionosphere that lead to radio scintillation that can interfere with operational systems. Because the height of the F-layer of the ionospheric plasma at night largely controls whether scintillation occurs, the vertical plasma drift is a key parameter among the several quantities the C/NOFS satellite was instrumented to measure in predicting whether scintillation occurs or not. Based on the operation of the C/NOFS IVM Ion Driftmeter and VEFI Electric Field Instrument over the two years since its launch, a climatological model of the vertical plasma drift has been obtained using long-term averages of the measurements. These drifts have been used in PBMOD, the first-principles model of the low-latitude ionosphere, bubble formation, and scintillation developed for the C/NOFS program, to see whether these drifts are in accord with observations of these phenomena. The DMSP satellites, in circular near-polar orbits around 840 km altitude, occasionally observe depletions in plasma density when they cross the geomagnetic equator in the evening and dawn sectors. Statistics for the frequency of observation of these depletions have been collected over the period of the C/NOFS mission. Recall that this period was a remarkably low and extended solar minimum, and the pattern of scintillation occurrence then is notably different from the standard paradigm of post-sunset occurrence. We will present maps of the frequency of occurrence of depletions, calculated with the models using the C/NOFS drift climatology, as a function of season and longitude, and compare the results with DMSP and other observations.
de La Beaujardiere Odile
Gentile Louise C.
Pfaff Robert F.
Retterer John M.
Stoneback R. A.
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