Vertical profiles of the equilibrium properties of a waveguiding magnetic flux tube based on the stratified density and magnetic field intensity models described by Eqs. (15) and (16). (a) Stratified Alfvén speed (C_A(z)) inside the flux tube (Eq. (19)) with maximum at around 1.5 solar radii. (b) Stratified tube speed inside the flux tube $(C_{{}_T}(z)\equiv \frac{C_A^2{C}_s^2}{C_A^2+C_s^2})$. (c) Profile of the normalized equilibrium cross-section of the flux tube (Eq. (17)) relative to the tube cross-section at the base of the corona $\left(\frac{A_0(z)}{A_0(0)}\right)$, as a function of height which is normalized by the radius of the sun. The Alfvén speed near the corona’s base is 1000 km/s.