Temporal evolution of the WEF for the Alfvén wave packet at the different positions on the slit S₃ (see Figure 5). Here the dotted line and the solid line respectively correspond to kinetic and total energy (kinetic+magnetic) associated with the WEF. At point “a” the packet has an energy flux of about 2140 W m⁻², which then decreases gradually at the different points owing to the curved magnetic field. Thereafter it reaches a constant value of 860 W m⁻² and propagates up to very far distance along the horizontal field line.