We examine the clock angle dependence of the solar wind power input into the magnetosphere using the Grand Unified Magnetosphere Ionosphere Coupling Simulation (GUMICS-4). We compute the power input through the magnetopause systematically in four events where the solar wind parameters are otherwise kept constant, but the interplanetary magnetic field ( IMF) clock angle theta is rotated from 0 degrees to 360 degrees. We find that when the clock angle rotates from north to south, the power input is well represented by sin(2)(theta/2). However, during the return rotation from south to north, the power input in the simulation remains enhanced longer than a sin(2)(theta/2) dependence would indicate. We suggest that the enhanced energy input during the return rotation may be a consequence of the nature of the reconnection process at the magnetopause.
- GLOBAL MHD SIMULATION
- ENERGY INPUT