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Favourable conditions for magnetic field generation in Earth-like planets

Breuer, D. (2007) Favourable conditions for magnetic field generation in Earth-like planets. In: 2nd European Planetary Science Congress, EPSC2007-A-00403. European Planetary Science Congress (EPSC), 2007-08-20 - 2007-08-24, Potsdam, Germany.

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The magnetic field of Earth-like planets, which can protect the atmosphere against strong solar erosion and life against cosmic rays, is generated in their iron-rich cores. To generate a magnetic field, the fluid (or partly fluid) core must be convecting. The convection is either caused by purely thermal instabilities in a totally fluid core or by thermal and compositional instabilities in a core with a growing inner core. In both cases the core needs to cool although the strength of cooling can differ. For a purely thermally driven dynamo the core heat flow needs to be higher than a critical heat flow that corresponds to the heat flow along the core adiabate. Whereas for a core with a growing inner core, the cooling can be less efficient but the core temperatures have to between the solidus and liquidus of the core material. Thus, whether convection takes place depends on various parameters such as the core composition, the efficiency of heat transfer (plate tectonics versus one-plate dynamics, mantle rheology), and the initial temperature distribution after the core has formed. In the present paper I will discuss different scenarios and conditions of Earth-like planets which are favourable for core convection and thus dynamo generation.

Item URL in elib:https://elib.dlr.de/51093/
Document Type:Conference or Workshop Item (Speech)
Title:Favourable conditions for magnetic field generation in Earth-like planets
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:August 2007
Journal or Publication Title:2nd European Planetary Science Congress
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:EPSC2007-A-00403
Keywords:magnetic fields
Event Title:European Planetary Science Congress (EPSC)
Event Location:Potsdam, Germany
Event Type:international Conference
Event Dates:2007-08-20 - 2007-08-24
Organizer:Europlanet (European Planetology Network)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Vergleichende Planetologie (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Musiol, Stefanie
Deposited On:29 Aug 2007
Last Modified:27 Apr 2009 14:19

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