scholarly journals Scaling properties of convection-driven dynamos in rotating spherical shells and application to planetary magnetic fields

2006 ◽  
Vol 166 (1) ◽  
pp. 97-114 ◽  
Author(s):  
U. R. Christensen ◽  
J. Aubert
Keyword(s):  
Magnetic Fields ◽  
Spherical Shells ◽  
Scaling Properties ◽  
Planetary Magnetic Fields

scholarly journals Planetary Magnetic Fields and Habitability in Super Earths

2018 ◽  
Vol 27 (1) ◽  
pp. 183-231 ◽  
Author(s):  
Pablo Cuartas-Restrepo
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Scaling Laws ◽  
Thermal Evolution ◽  
Solid Core ◽  
Direct Influence ◽  
Physical Processes ◽  
Planetary Magnetic Fields ◽  
Planetary Magnetic Field ◽  
Planetary Dynamos

Abstract This work seeks to summarize some special aspects of a type of exoplanets known as super-Earths (SE), and the direct influence of these aspects in their habitability. Physical processes like the internal thermal evolution and the generation of a protective Planetary Magnetic Field (PMF) are directly related with habitability. Other aspects such as rotation and the formation of a solid core are fundamental when analyzing the possibilities that a SE would have to be habitable. This work analyzes the fundamental theoretical aspects on which the models of thermal evolution and the scaling laws of the planetary dynamos are based. These theoretical aspects allow to develop models of the magnetic evolution of the planets and the role played by the PMF in the protection of the atmosphere and the habitability of the planet.

Planetary Magnetic Fields and Solar Forcing: Implications for Atmospheric Evolution

2007 ◽  
Vol 129 (1-3) ◽  
pp. 245-278 ◽  
Author(s):  
Rickard Lundin ◽  
Helmut Lammer ◽  
Ignasi Ribas
Keyword(s):  
Magnetic Fields ◽  
Solar Forcing ◽  
Atmospheric Evolution ◽  
Planetary Magnetic Fields

Response : Planetary Magnetic Fields and Rotation

Science ◽  
1967 ◽  
Vol 158 (3801) ◽  
pp. 674-674
Author(s):  
J. A. Van Allen
Keyword(s):  
Magnetic Fields ◽  
Planetary Magnetic Fields

Planetary Magnetic Fields and Rotation

Science ◽  
1967 ◽  
Vol 158 (3801) ◽  
pp. 674-674
Author(s):  
Robert T. Brown
Keyword(s):  
Magnetic Fields ◽  
Planetary Magnetic Fields

Planetary Magnetic Fields and Rotation

Science ◽  
1967 ◽  
Vol 158 (3801) ◽  
pp. 674-674
Author(s):  
Robert T. Brown
Keyword(s):  
Magnetic Fields ◽  
Planetary Magnetic Fields

Equipotential transformation from multipole systems to dipole systems

1987 ◽  
Vol 414 (1847) ◽  
pp. 359-369
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Spherical Harmonic ◽  
Magnetic Moments ◽  
Numerical Comparison ◽  
Magnetic Dipoles ◽  
Planetary Magnetic Fields ◽  
Vector Sum ◽  
Planetary Magnetic Field ◽  
Good Agreement

The paper shows that a planetary magnetic field expressed in the conventional form of a spherical harmonic expanson can be completely represented by the vector sum of fields produced by a set of magnetic dipoles with different magnetic moments, tilted from the planetary spin axis and offset from the planetary centre by different amounts. For convenience, the transformation from multipole systems to dipole systems is restricted to that from multipoles up to octupole to five dipoles. The scalar equipotential transformation analytically results in 24 equations; these can be subsequently solved for the 24 adjustable parameters in dipole systems with the predetermined ‘main dipole’. The numerical comparison of the jovian magnetic field between the jovian O 4 and the five-dipole models reveals a very good agreement with the subtle details. It is obvious that this type of transformation would open up the simplest practical way to simulate planetary magnetic fields with the dipole patterns.

scholarly journals On the influence of magnetic fields in neutral planetary wakes

2016 ◽  
Vol 12 (S328) ◽  
pp. 192-197
Author(s):  
C. Villarreal D’Angelo ◽  
M. Schneiter ◽  
A. Esquivel
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Radiation Pressure ◽  
Stellar Wind ◽  
Magnetic Moments ◽  
Radiative Processes ◽  
Planetary Magnetic Fields ◽  
Stellar Magnetic Fields

AbstractWe present a 3D magnetohydrodynamic study of the effect that stellar and planetary magnetic fields have on the calculated Lyα absorption during the planetary transit, employing parameters that resemble the exoplanet HD209458b. We assume a dipolar magnetic field for both the star and the planet, and use the Parker solution to initialize the stellar wind. We also consider the radiative processes and the radiation pressure.We use the numerical MHD code Guacho to run several models varying the values of the planetary and stellar magnetic moments within the range reported in the literature.We found that the presence of magnetic fields influences the escaping neutral planetary material spreading the absorption Lyα line for large stellar magnetic fields.

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