Time evolution of the synthetic loop at μ = 1. From the top to the bottom: normalised Hα blue wing intensity at v_D = 53 km s⁻¹, Hα Dopplergram at velocities ±53 km s⁻¹ (black and white represent red and blue wings, respectively), Si IV 1393 Å summed over frequencies ±0.79 Å around line centre, composite image of the Hα Dopplergram (black and white) and frequency-summed Si IV (orange), Hα line core, composite image of Hα line core and frequency-summed Si IV and vertical magnetic field (black and white represent downward and upward magnetic field, respectively).