IMF control of Alfvénic energy transport and deposition at high latitudes

IMF on high-latitude inertial Alfven wave (IAW) activity in the magnetosphere-ionosphere transition region using Fast Auroral SnapshoT (FAST) satellite observations. We find evidence that negative IMF B-z coincides with nightside IAW power generation and enhanced rates of IAW-associated electron energy deposition, while positive IMF B-z coincides with enhanced dayside wave and electron energy deposition.

Large (greater than or similar to 5 nT) negative IMF B-y coincides with enhanced postnoon IAW power, while large positive IMF B-y coincides with enhanced but relatively weaker prenoon IAW power. For each.. IMF orientation we compare IAW Poynting flux and IAW-associated electron energy flux distributions with previously published distributions of Alfvenic Poynting flux over similar to 2-22 mHz, as well as corresponding wave-driven electron energy deposition derived from Lyon-Fedder-Mobarry global MHD simulations.