Free oscillations of the earth-like planets in the presence of magnetic field
Publish place: The Physics Society Of Iran، Vol: 5، Issue: 4
Publish Year: 1384
Type: Journal paper
Language: English
View: 485
This Paper With 8 Page And PDF Format Ready To Download
- Certificate
- I'm the author of the paper
Export:
Document National Code:
JR_PSI-5-4_010
Index date: 20 January 2019
Free oscillations of the earth-like planets in the presence of magnetic field abstract
we study the free oscillations of a non-rotating earth-like planet in the presence of a force free magnetic field. The model consists of a solid inner core, a liquid outer core and a solid mantle which is spherically symmetric. The lagrangian displacements are decomposed into scaloidal, poloidal and toroidal components using a gauged version of Helmholtz theorem. These components are identified, with p -, g - and t -modes, respectively. The normal modes of the model are determined using a Rayleigh-Ritz variational technique. The consequence of the presence of the solid parts and the magnetic field is the emergence of pure t -oscillations. The magnetic field, in addition to exciting t -modes, couples the everpresent p -and g -modes together. As an application of the model, the real seismic data of the earth is used to calculate eigenvalues and eigenvectors for different modes.
Free oscillations of the earth-like planets in the presence of magnetic field Keywords: