Book contents
- Geomagnetism, Aeronomy and Space Weather
- Special Publications of the International Union of Geodesy and Geophysics Series
- Geomagnetism, Aeronomy and Space Weather
- Copyright page
- Contents
- Contributors
- Preface
- Part I Introduction
- Part II Geomagnetic Field
- 4 Geomagnetic Field Sources
- 5 Can Paleomagnetism Distinguish Dynamo Regimes?
- 6 Geomagnetic and Electromagnetic Observations at Ground Level
- 7 Modelling Internal and External Geomagnetic Fields Using Satellite Data
- 8 New Insights in Far-Space Measurements
- Part III Spatial and Temporal Variations of the Geomagnetic Field
- Part IV Space Weather
- Part V Magnetic Fields beyond the Earth and beyond Today
- Index
- References
5 - Can Paleomagnetism Distinguish Dynamo Regimes?
from Part II - Geomagnetic Field
Published online by Cambridge University Press: 25 October 2019
Book contents
- Geomagnetism, Aeronomy and Space Weather
- Special Publications of the International Union of Geodesy and Geophysics Series
- Geomagnetism, Aeronomy and Space Weather
- Copyright page
- Contents
- Contributors
- Preface
- Part I Introduction
- Part II Geomagnetic Field
- 4 Geomagnetic Field Sources
- 5 Can Paleomagnetism Distinguish Dynamo Regimes?
- 6 Geomagnetic and Electromagnetic Observations at Ground Level
- 7 Modelling Internal and External Geomagnetic Fields Using Satellite Data
- 8 New Insights in Far-Space Measurements
- Part III Spatial and Temporal Variations of the Geomagnetic Field
- Part IV Space Weather
- Part V Magnetic Fields beyond the Earth and beyond Today
- Index
- References
Summary
This section describes a paleomagnetic approach to test whether the geodynamo has existed in distinct operating modes through Earth’s history. A central question surrounds how the geodynamo functions during superchrons, where periods lasting 10’s of millions of years passed with no reversals, versus times closer to the present, when reversals happened four to five times per million years. Five numerical dynamos with characteristic reversal frequencies ranging from 2 to 13 Myr-1 were studied to derive the parameters that discriminate them using datasets routinely acquired by paleomagnetists. Once defined, the feasibility of the approach was tested through field and laboratory work.
- Type
- Chapter
- Information
- Geomagnetism, Aeronomy and Space WeatherA Journey from the Earth's Core to the Sun, pp. 48 - 53Publisher: Cambridge University PressPrint publication year: 2019
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