Simple stochastic model for geomagnetic excursions and reversals reproduces the temporal asymmetry of the axial dipole moment.
We present a simple model for the axial dipole moment (ADM) of the geomagnetic field based on a stochastic differential equation for two coupled particles in a biquadratic potential, subjected to Gaussian random perturbations. This model generates aperiodic reversals and excursions separated by stab...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/112969 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/112969 |
| Access Level: | acceso abierto |
| Palabra clave: | 55 536 Geomagnetic reversals Stochastic model Temporal asymmetry Geomagnetism Paleomagnetism Geofísica Física-Modelos matemáticos 2507.01 Geomagnetismo y Prospección Magnética 2507.04 Paleomagnetismo 2205.10 Mecánica Estadística |
| Sumario: | We present a simple model for the axial dipole moment (ADM) of the geomagnetic field based on a stochastic differential equation for two coupled particles in a biquadratic potential, subjected to Gaussian random perturbations. This model generates aperiodic reversals and excursions separated by stable polarity periods. The model reproduces the temporal asymmetry of geomagnetic reversals, with slower decaying rates before the reversal and faster growing rates after it. This temporal asymmetry is possible because our model is out of equilibrium. The existence of a thermal imbalance between the two particles sets a preferential sense for the energy flux and renders the process irreversible. |
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