Study of ionospheric anomalies due to impact of typhoon using Principal Component Analysis and image processing

Principal Component Analysis (PCA) and image processing are used to determine Total Electron Content (TEC) anomalies in the F-layer of the ionosphere relating to Typhoon Nakri for 29 May, 2008 (UTC). PCA and image processing are applied to the global ionospheric map (GIM) with transforms conducted for the time period 12:00?C14:00?UT on 29 May, 2008 when the wind was most intense. Results show that at a height of approximately 150?C200?km the TEC anomaly is highly localized; however, it becomes more intense and widespread with height. Potential causes of these results are discussed with emphasis given to acoustic gravity waves caused by wind force.