Hydromagnetic Wave
a wave in which both the plasma and magnetic field oscillate.
The speed at which hydromagnetic waves are propagated along a magnetic field: (VA) = B / (4 )1/2. [H76]
Alfvén Waves ...
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.
The magnetic disturbances were originally interpreted as hydromagnetic waves, but it was soon realized that they were due to field-aligned or Birkeland currents.
The pressure of the incoming plasma is transmitted to the outer edge of the Earth's magnetosphere; this causes an increase in the observed geomagnetic field at the ground, perhaps through hydromagnetic waves.
 See also: Energy, Satellite, Earth, Total, Solar wind
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