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Under the combined forces of magnetism and gravity the two modes again remain distinct. Gravity waves can propagate at frequencies less than ω_{BV} at small horizontal wavevector (essentially the Lorentz force opposes the transverse variation), and at frequencies greater than v_{A}^{2}**k**_{x}^{2} (Lou 1995). There are also a pair of upward- and downward- propagating waves at frequencies greater and less than ω_{BV} respectively.

James McAteer
2004-01-14