Charney-Hasegawa-Mima
equation
¥
Ψ
–
streamfunction
(electrostatic potential).
¥
ρ
–
Deformation radius (ion Larmor radius).
¥
β
–
PV gradient (diamagnetic drift).
¥
x
–
east-west (poloidal arc-length)
¥
y
–
south-north (radial length).