Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10630415k&link_type=abstract
Journal of Geophysical Research, Volume 106, Issue A12, p. 30415-30428
Mathematics
Logic
1
Ionosphere: Ionospheric Disturbances, Ionosphere: Midlatitude Ionosphere, Ionosphere: Modeling And Forecasting, Ionosphere: Instruments And Techniques
Scientific paper
The theoretical data assimilative model of the ionosphere (TDAMI) was created to answer the most challenging problem in ionospheric physics: modeling the ionospheric disturbances (in particular, parameters related to the peak of the F layer: f0F2 and hmF2) during geomagnetic storms. It is an analytical model that calculates maximum electron density (Nm) distribution and the height of this maximum (hm) as a function of time, latitude, longitude, season and solar activity. Tested as a ``climatological,'' i.e., monthly average, model over the worldwide midlatitude ionospheric data set for different seasons and solar activity conditions, TDAMI yields results comparable with the well-known empirical models of the International Radio Consultative Committee (CCIR) and the Union Radio Scientifique Internationale (URSI). The mean annual relative error in f0F2 is <8% for all levels of solar activity, while the mean seasonal errors do not exceed 12%. A comparison between the model simulations and all existing vertical incidence (VI) data for the geomagnetically disturbed period October 10-11, 1988, shows that TDAMI adequately simulates the UT-latitudinal-longitudinal dependence of the ionospheric reaction to the geomagnetic disturbance. During the hours of maximum depletion in the electron density, the improvement achieved by the model is more than 70-80% compared to international reference ionosphere (IRI) global distributions (by CCIR and URSI coefficients sets). The maximum TDAMI model error is 20-25%.
Kilifarska Natalya A.
Ouzounov D. P.
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