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Дата изменения: Sat Jun 2 08:35:28 2001 Дата индексирования: Sun Dec 23 08:47:59 2007 Кодировка: Поисковые слова: agn |
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East-Siberian Center for the Earth's Ionosphere Research (SDC ESCEIR)Institute of Solar-Terrestial Physics SB RASUpper Atmosphere Physics and Radiowave Propagation Department |
Composition
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Mathematical modelling and information support subdivisionMaximum usable frequencies on-line predictionThe on-line prediction procedure is based on the Newton interpolation formulae for a uniform distribution of the variable with first, second and third argument powers restrictions (Kurkin V.I. , Polekh N.M., Tchistyakova L.V. MAF operative prognosis for oblique ionosphere sounding// Issledovaniya po geomagnrtismu, aeronomii i phisike Solntsa. - SB RAS publishing, issue. 105., 1997). Interpolating polynomial coefficients are derived by finite differences calculated for a current model extrapolation interval and for past time interval experimental data. On the basis of this algorithm we develop a computational scheme for real-time on-line prediction, which can perform sequentially the following operations:
These calculations have shown that the linear approximation of the on-line prediction has the best precision when using long-run prediction values independent of the interval and ionospheric disturbance level. In the figure we present MUF daily variations for different days, for quiet and disturbed geomagnetic conditions. |