A new scaling law of the planetary magnetic fields

1992 ◽  
Vol 12 (8) ◽  
pp. 265-279 ◽  
Author(s):  
Hitoshi Mizutani ◽  
Tetsuo Yamamoto ◽  
Akio Fujimura
Keyword(s):  
Magnetic Fields ◽  
Scaling Law ◽  
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 Rotating Constricted Switching Arcs Burning in Gas and in Vacuum

2017 ◽  
Vol 4 (2) ◽  
pp. 173-176
Author(s):  
D. Baron ◽  
S. Ettingshausen ◽  
M. Koletzko ◽  
A. Lawall ◽  
T. Rettenmaier ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
High Velocity ◽  
Scaling Law ◽  
Metal Vapor ◽  
Transverse Magnetic ◽  
High Current ◽  
Circuit Breakers ◽  
Current Interruption ◽  
Magnetic Probes ◽  
Contact Size

The method of controlling high-current switching arcs by transverse magnetic fields (TMF) forcing the constricted arc to rotate in a contact system is being applied successfully to improve the breaking capability of vacuum interrupters and gas circuit breakers. We describe the behavior of magnetically driven switching arcs in vacuum and in gas environment. We report on experiments using high-velocity videography, magnetic probes, and spectroscopy; they deliver the velocity, the temperature and the voltage of an arc. We present models and simulations of the moving constricted arc burning in metal vapor and in air. And we describe a particular switching application of TMF arc control and explain a scaling law of the contact size with the current interruption capability.

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