Secular variations in the main geomagnetic field within the scope of the dynamic model of field sources

Autor:	Yu. G. Farafonova, L. V. Nikitina, I. M. Demina
Rok vydání:	2008
Předmět:	Superposition principle Dipole Geophysics Earth's magnetic field Geomagnetic secular variation Field (physics) Space and Planetary Science Anomaly (natural sciences) Physics::Space Physics Boundary (topology) Geology Secular variation
Zdroj:	Geomagnetism and Aeronomy. 48:542-550
ISSN:	1555-645X 0016-7932
DOI:	10.1134/s0016793208040166
Popis:	The effect of different-level sources on the spatial structure of the secular variations has been considered based on the dynamic model of sources of the main geomagnetic field developed by us. It has been obtained that the development of 13 most powerful dipoles only roughly characterizes global anomalies of the secular variations, and each anomaly results from the superposition of the dynamics of several sources. The model secular variations have been compared with the data from the observatories. It has been obtained that it is impossible to describe local anomalies of the observed secular variations ignoring sources of the third order of smallness as compared to the main dipole. It has been assumed that topographic vortices, originating around inhomogeneities of the core-mantle boundary, can be physical sources responsible for dipoles of the third order.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c20ed22adb6fb645f9f9c878279072cf https://doi.org/10.1134/s0016793208040166 Zobrazit plný text záznamu Full text from SpringerLink