From superchrons to secular variation: A broadband dynamo frequency spectrum for the geomagnetic dipole

Earth and Planetary Science Letters

Volumn 319-320, Issue , 2012, Pages 75-82

  Olson, Peter L ^a   Christensen, Ulrich R ^b   Driscoll, Peter E ^c  

^a JOHNS HOPKINS UNIVERSITY   (United States)

^b MAX PLANCK INSTITUT FÜR SONNENSYSTEMFORSCHUNG   (Germany)

^c YALE UNIVERSITY   (United States)

Author keywords

Dipole variations; Earth's core; Geodynamo; Geomagnetic spectrum

Indexed keywords

ACCELERATION SPECTRUM; BROADBAND FREQUENCY; COMPOSITE SPECTRA; DIPOLE FIELDS; DIPOLE VARIATIONS; EARTH'S CORE; FLUID VELOCITIES; FREQUENCY SPECTRA; GEODYNAMO; GEOMAGNETIC POLARITY; GEOMAGNETIC SECULAR VARIATION; GEOMAGNETIC SPECTRUM; HIGH FREQUENCY BANDS; HIGHER FREQUENCIES; INPUT PARAMETER; INTENSITY VARIATIONS; LOW FREQUENCY BAND; MAGNETIC PRANDTL NUMBERS; MAGNETIC REYNOLDS NUMBER; NUMERICAL DYNAMOS; PALEOINTENSITY; PEAK VALUES; RAYLEIGH; SECULAR VARIATION; SPECTRAL SLOPES; TIME-SCALES; ULTRA-LOW FREQUENCIES; VERY HIGH FREQUENCY;

ANOXIC SEDIMENTS; DC GENERATORS; FREQUENCY BANDS; INTERACTIVE DEVICES; REYNOLDS NUMBER; SPECTROSCOPY;

GEOMAGNETISM;

CORE (PLANETARY); FREQUENCY ANALYSIS; GEODYNAMO; GEOMAGNETIC FIELD; PALEOMAGNETISM; SECULAR VARIATION; SPECTRUM;

EID: 84856028113     PISSN: 0012821X     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.epsl.2011.12.008     Document Type: Article

References (25)

1. Aubert J., Labrosse S., Poitou C. Modeling the palaeo-evolution of the geodynamo. Geophys. J. Int. 2009, 179:1414-1428.
2. Barton C.E. Spectral analysis of paleomagnetic time-series and the geomagnetic spectrum. Philos. Trans. R. Soc. Lond. 1982, A306:203-209.
3. Christensen U., Aubert J. Scaling properties of convection-driven dynamos in rotating spherical shells and application to planetary fields. Geophys. J. Int. 2006, 166:97-114.
4. Christensen U., Aubert J., Hulot G. Conditions for Earth-like geodynamo models. Earth Planet. Sci. Lett. 2010, 296:487-496.
5. Consolini G., Michelis P., Meloni A. Fluid motion in the Earth's core inferred from time spectral features of the geomagnetic field. Phys. Rev. E 2002, 65:037303.
6. Constable C., Johnson C. A paleomagnetic power spectrum. Phys. Earth Planet. Inter. 2005, 153:61-73.
7. Courtillot C., Le Mouel J.-L. Time variations of the Earth's magnetic field: from daily to secular. Annu. Rev. Earth Planet. Sci. 1988, 16:389-476.
8. Curie R.G. Geomagnetic spectrum of internal origin and lower mantle conductivity. J. Geophys. Res. 1968, 73:2779-2790.
9. Driscoll P., Olson P. Polarity reversals in geodynamo models with core evolution. Earth Planet. Sci. Lett. 2009, 282:24-33.
10. Driscoll P., Olson P. Superchron cycles driven by variable core heat flow. Geophys. Res. Lett. 2011, L09304. 10.1029/2011GL046808.
11. Gillet N., Jault D., Canet E., Fournier A. Fast torsional oscillations and strong magnetic field within the Earth's core. Nature 2010, 465:74-77.
12. Glatzmaier G.A., Coe R.S., Hongre L., Roberts P.H. The role of the Earth's mantle in controlling the frequency of geomagnetic reversals. Nature 1999, 401:885-890.
13. Guyodo Y., Valet J.-P. Global changes in intensity of the Earth's magnetic field during the past 800kyr. Nature 1999, 399:249-252.
14. Jackson A., Jonkers A.R.T., Walker M.R. Four centuries of geomagnetic secular variation from historical records. Philos. Trans. R. Soc. Lond. 2000, A358:947-990.
15. Kageyama A., Miyagoshi T., Sato T. Formation of current coils in geodynamo simulations. Nature 2008, 454:1106-1109.
16. Korte M., Constable C.G. Continuous geomagnetic field models for the past 7 millennia: 2. CALS7K. Geochem. Geophys. Geosyst. 2005, 6(2). 10.1029/2004GC000801.
17. Olsen N., Sabaka T.J., Lowes F.J. New parameterization of external and induced fields in geomagnetic modeling, and a candidate model for IGRF 2005. Phys. Planets Space 2005, 57:1141-1149.
18. Olson P., Christensen U.R. Dipole moment scaling for convection-driven planetary dynamos. Earth Planet. Sci. Lett. 2006, 250:561-571.
19. Sakuraba A., Hamano Y. Turbulent structure in Earth's fluid core inferred from time series of geomagnetic dipole moment. Geophys. Res. Lett. 2007, 34:L15308.
20. Sakuraba A., Roberts P. Generation of a strong magnetic field using uniform flux at the surface of the core. Nat. Geosci. 2009, 2:802-805.
21. Tanriverdy V., Tilgner A. Global fluctuations in magnetohydrodynamic dynamos. New J. Phys. 2011, 13:033019. 10.1088/1367-2630/13/3/033019.
22. Thouveny N., Bourles D.L., Saracco G., Carcaillet J.T., Bassionot F. Paleoclimatic contect of geomagnetic dipole lows and excursions in the Brunhes, clue for an orbital influence on the geodynamo?. Earth Planet. Sci. Lett. 2008, 275:264-284.
23. Valet J.P., Meynadier L., Guyodo Y. Geomagnetic dipole strength and reversal rate over the past twomillionyears. Nature 2005, 435:802-805.
24. Welch P.D. The use of fast Fourier transform for the estimation of power spectra: a method based on time averaging over short, modified periodograms. IEEE Trans. Audio Electroacoust. 1967, AU-15:70-73.
25. Ziegler L.B., Constable C.G., Johnson C.L., Tauxe L. PADM2M: a penalized maximum likelihood model of the 0-2Ma palaeomagnetic axial dipole moment. Geophys. J. Int. 2011, 184:1069-1089.