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The role of rotation on the evolution of dynamo generated magnetic fields in Super Earths | | Jorge I. Zuluaga
; Pablo A. Cuartas-Restrepo
; | | Date: |
4 Jan 2011 | | Abstract: | Planetary magnetic fields could have a role on the evolution of planetary
atmospheres and the required conditions for the emergence and evolution of life
(habitability). After briefly review the current efforts to study the evolution
of dynamo generated magnetic fields in massive earth-like rocky planets (Super
Earths), we take the results from thermal evolution models and updated scaling
laws for convection driven magnetodynamos to predict the evolution of the local
Rossby number, the basic indicator of core magnetic field geometry and regime.
We study the dependence of this property on planetary mass and rotation rate.
Previous works have paid Attention only to the evolution of dipolar dominant
core magnetic fields assuming rapid rotating planets. Here we extend these
results including consistently the effects of rotation on the evolution of
planetary magnetic field properties and obtain global constraints to the
existence of intense protective magnetic fields in rapidly and slowly rotating
Super Earths. We find that the emergence and endurance of a protective
planetary magnetic field would not be only a function of planetary mass but
also would depend on rotation rates in interesting ways. Low mass Super Earths
($M<2ME$) would develop an intense surface magnetic field but its lifetime
will be limited to 2-4 Gyrs for rotational periods exceeding 1.5 days. On the
other hand and also in the case of slowly rotating planets more massive Super
Earths will have a weak magnetic fields but their dipoles would last longer.
Finally we analyze the case for tidally locked Super Earths inside and outside
the habitable zone of GKM stars where long rotation periods will be common.
Using the results obtained here we develop a classification of Super Earths
based on their rotation and depending on the emergent evolving properties of
dynamo generated planetary magnetic fields. | | Source: | arXiv, 1101.0691 | | Services: | Forum | Review | PDF | Favorites | |
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