Method for Estimating Neutral Wind Azimuth using 2D TID Propagation Parameters

We test wind-filtering hypothesis based on long-term TIDs observations by the Hokkaido East SuperDARN radar. Method for estimating neutral wind azimuth using 2-dimensional TIDs propagation parameters is developed and tested. Calculated wind azimuth generally corresponds to the HWM2007 model, excepting midnight hours. Differences between estimations and model at midnight most probably caused by the presence of TIDs not corresponding to internal gravity waves (IGW), or by wind behavior features not described by HWM2007. The proposed method is universal and allows estimating neutral wind azimuth from any 2-dimensional TID phase velocity vector distributions. It can be useful for improving neutral wind models and/or for studying the factors not taken into account by wind models.