Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa12a0668g&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA12A-0668
Mathematics
Logic
2447 Modeling And Forecasting, 2463 Plasma Convection, 2475 Polar Cap Ionosphere
Scientific paper
The Utah State University (USU) Time Dependent Ionospheric Model (TDIM) simulates the high latitude ionosphere for the storm study day of January 14, 1988, based upon inputs of electric field convection patterns using the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) technique. The quasi-steady state development of tongues of ionization (TOIs) emerges in the simulation at the peak of storm time forcing. A three-dimensional analysis of the structure of the TOIs is presented in this paper, with morphological features closely tied to convection pattern traits. An unambiguous bifurcated density pattern develops in the polar cap consisting of two independent TOIs, one related to the dusk convection cell and the other related to the dawn convection cell, with a narrow low density trough between them. This newly predicted feature is given the name Polar Dayside Upward Convecting Trough (Polar DUCT). The structural definition of the TOIs also includes a definite altitude profile along the extent of the high density plasma flowing into the polar cap. The height of the F-layer peak (NmF_2) in the extended TOI first rises dramatically at the point of entry into the cusp/throat region, then drops steadily as plasma approaches the pole. The altitude profiles of the dusk and dawn TOI are independent, with differences due to distinctions in the characteristics of the dawn and dusk convection cells.
Groves C. M.
Knipp Delores J.
Schunk Robert W.
Sojka Jan J.
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