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The speed at which hydromagnetic waves are propagated along a magnetic field: (VA) = B / (4 )1/2. [H76] Alfvén Waves ...
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Used for Alfvén waves, hydromagnetic waves, and plasma sound waves. magnetohydro dynamics (NASA Thesaurus / NASA SP-7, 1965) (abbr MHD) The study of the interaction that exists between a magnetic field and an electrically conducting fluid.
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Hydromagnetic Wave A wave in which both the plasma and magnetic field oscillate. Intensity Map A color-coded map of radiation intensity as a function of position. Different colors or shades represent different intensities of observed radiation.
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1942: Alfvén suggests the existence of electromagnetic- hydromagnetic waves in a paper published in Nature. 1949: Laboratory experiments by S. Lundquist produce such waves in magnetized mercury, with a velocity that approximated Alfvén's formula.
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The magnetic disturbances were originally interpreted as hydromagnetic waves, but it was soon realized that they were due to field-aligned or Birkeland currents.
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 See also: Earth, Rays, Magnetic Field, Plasma, Ionosphere
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