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THE INTERACTION OF MOVING SOURCE CURRENTS WITH A HYDROMAGNETIC FLUID,
BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH
An incompressible fluid of finite conductivity is assumed to be permeated by a uniform magnetic field. We calculate the field of an arbitrarily oriented, weak magnetic dipole moving along the direction of the uniform field. The results reduce to those of others in the limit of no uniform field sufficiently far from the source. The main result is that the far field of the dipole the field outside of the wake is the vacuum dipole field times the factor which in cludes the dipole speed and Alfven speed. A general theorem is proved neglecting mechani cally induced disturbances outside of the wake. It is also shown that an accurate treatment of the problem, when source speed is close to Alfven speed, requires the inclusion of dis placement currents. Author
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