Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa51b1617c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA51B-1617
Physics
[2415] Ionosphere / Equatorial Ionosphere, [2447] Ionosphere / Modeling And Forecasting, [2467] Ionosphere / Plasma Temperature And Density, [2481] Ionosphere / Topside Ionosphere
Scientific paper
The ion velocity meter (IVM), a part of the CINDI instrument on board the C/NOFS spacecraft, is used to make ion density (Ni) and temperature (Ti) measurements in the low-latitude topside ionosphere in the 400-850 km altitude range during the 2009-2010 time period. Averages of the Ni measurements are then compared to the daily F10.7 radio flux values that serve as a proxy for solar EUV input to the ionosphere. Before this comparison the IVM ion densities are normalized to a constant 550 km altitude level using the International Reference Ionosphere. First results from daytime data during December 2009-March 2010 indicate the presence of 30-40% Ni variations with an approximately 27-day period. Cross correlation between the density measurements and the daily F10.7 values shows that the ion density variations lag F10.7 by approximately two days in phase. We also investigate the correlation of F10.7 with ion temperature.
Coley William R.
Heelis Roderick A.
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