Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa43a..07b&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA43A-07
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2447 Modeling And Forecasting, 2475 Polar Cap Ionosphere, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
The dynamic behavior of the "generalized" polar wind is investigated using a 3-D dynamic model that extends from an altitude of 90 km to several Earth radii. The relevant equations are solved along magnetic flux tubes that convect across the high latitude region. A large number (~ 1000) of plasma flux tubes are followed. The total number of simulation particles in the mac-PIC component is 108-109. The generalized polar wind is simulated for an idealized geomagnetic storm. The model properly accounts for many physical mechanisms such as: ion-ion collisions, wave-particle interactions, magnetospheric energetic electrons, and low-altitude ion energization. The computing-intensive nature of the model requires utilization of super computers with thousands of processors. A 3-D picture is assembled from the temporal evolution of the individual flux tubes by keeping track of their locations. The resulting 3-D dynamic picture is investigated, and the main conclusions are: (1) During the storm maximum phase, O+ may remain dominant for altitudes up to several earth radii; (2) The O+-to-H+ density [n(O+)/n(H+)], velocity [ U(O+)/U(H+)], and flux [F(O+)/F(H+)], ratios tend to be greatly enhanced during the storm with time delays of 0.5 to 1 hour; (3) The O+ downward flow tends to occur in the subauroral region and the dawn-side of the polar cap; and (4) The O+ downward flux in the polar cap tends to occur below 1 RE altitude, and during the storm decay phase.
Barakat Aliaa
Schunk Robert W.
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