Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa31a1410d&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA31A-1410
Physics
Plasma Physics
[2411] Ionosphere / Electric Fields, [2415] Ionosphere / Equatorial Ionosphere, [7823] Space Plasma Physics / Ionization Processes
Scientific paper
The Communication/Navigation Forecasting System (C/NOFS) satellite was launched in April 2008 into an equatorial orbit at an altitude between 400 and 850 km, to study the equatorial ionosphere. The satellite sensors measure several parameters including the DC electric-fields and ion densities. Deep plasma density depletions are often observed around sunrise. They are seen at all satellite altitudes and sometimes associated with ionospheric irregularities. These depletions are also observed in other data sets, in particular in data from DMSP morning passes, and the CHAMP satellite at an altitude of 325 Km. By a careful examination of the electric field we find that there are 2 types of morning depletions. One is associated with upward plasma drifts; the other is associated with downward plasma drifts. The first type size is typically 50 x 14 degrees in the N-S and E-W directions respectively. The more common second type is much wider and can reach 75 degrees in longitude. Numerical simulations with the C/NOFS model (PBMod) show that the density depletions are explained by the changes in vertical plasma drift. Increases in the vertical drift close to sunrise appear similar to the sunset pre-reversal enhancement. We investigate if these plasma-drifts changes can be caused by space charges associated with density gradients at sunrise.
Burke William J.
Colman Jonah J.
Dao E.
de La Beaujardiere Odile
Kelley Michael C.
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