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Yes! UBK (Whipple, 78)
Average over Fm,FJ ==> 1st & 2nd adiabatic invariants. Then the total energy is:
H0= K.E. + P.E.
H0 = mBm(x,y) + q U(x,y)
dH0/dt = 0 = mdBm/dt + q dU/dt
dU/dBm = -m/q
Convection conserves energy, so constant energy trajectories = convection. In UB space these are straight lines. Coordinates SEPARATE! (Sheldon & Gaffey, 95)