Other
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4719c&link_type=abstract
Journal of Geophysical Research, vol. 80, Dec. 1, 1975, p. 4719-4724. Research supported by the McDonnell Douglas Astronautics
Other
Current Density, Electric Current, Electric Field Strength, Electromagnetic Fields, Solar Magnetic Field, Solar Wind, Interplanetary Magnetic Fields, Magnetic Dipoles, Magnetohydrodynamic Flow, Magnetohydrodynamic Waves, Solar Rotation, Solar Wind Velocity
Scientific paper
Some properties are examined of the electric currents that would be produced in the solar wind if the sun's magnetic field were a centered dipole with the axis of the dipole at an angle to the spin axis of the sun. It is found that there are two components of such a current: one resulting from the forced motion of solar plasma through the sun's magnetic field and the other due to the sun's rotation and unipolar induction. The strength of the first component is shown to depend only on the sun's dipole moment, while the strength of the second depends on the solar-wind velocity, the sun's angular velocity, and its dipole moment. It is found that the second component flows in heliographic meridional planes and that its electromagnetic forces tend to accelerate the plasma in the leading half of a magnetic sector and to decelerate it in the following half. The effect of the angle between the sun's spin axis and dipole axis on the electromagnetic force near the equatorial plane is described along with slowing of the sun's rotation by electromagnetic torque and possible electromagnetic contributions to the sun's differential rotation.
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