Global anomalies of the main geomagnetic field and the dynamic model of their sources

Autor: A. Sas-Uhrynowski, I. M. Demina, E. Welker, Yu. G. Farafonova
Rok vydání: 2006
Předmět:
Zdroj: Geomagnetism and Aeronomy. 46:129-138
ISSN: 1555-645X
0016-7932
DOI: 10.1134/s0016793206010142
Popis: The model of the main geomagnetic field sources, including 12 more dipoles in addition to the main dipole, is presented. The source parameters have been determined for the 100-year-long period at an interval of 5 years. The problem is solved using the iteration method proposed and developed by the authors. Six more sources have been included in the iteration process at its current step. This made it possible to substantially smooth the time variations in the dipole parameters obtained previously and, on the other hand, to describe all global anomalies of the main geomagnetic field using this model. A change in the parameter values can be approximated by rather smooth functions describing specific features of development of the sources operating for 20–30 years. However, the short duration of the obtained series (21 points) makes the problem of prediction substantially more difficult. The parameters of 13 dipoles, extrapolated for 2000 using the linear prediction filter, are in good agreement only with the general development of the sources.
Databáze: OpenAIRE
Externí odkaz: