Solar wind-driven Alfvénic energy flow in the dayside magnetosphere

There is ample evidence for significant Alfvénic activity in the dayside magnetosphere. One reported aspect has been the relationship between the IMF/solar wind parameters and the global Alfvénic Poynting flux in the coupled system. In this investigation, we add to the body of knowledge by presenting the dynamics of Alfvén waves as a global phenomenon as it occurs at the entry point to the dayside auroral acceleration region. In particular, we show how the global Alfven wave power and morphology evolves during geomagnetic storm developments, from storm sudden commencement to the end of storm recovery. To investigate this, we used data from the Polar satellite. By comparing our results with observations from low-altitude satellites, we demonstrate the dissipation of Alfvénic power in the dayside. During storms, the transfer of energy from the solar wind into geospace is largely increased, leading to enhanced energy transfer and deposition within the magnetosphere and ionosphere. Here, we are aiming to understand the wave aspect during storm evolution.