Travelling Ionospheric Disturbances nowcasting HF-based methodology and its validation with GNSS-TEC analysis techniques

A new technique for Travelling Ionospheric Disturbances (TID) identification in near-real time is presented, which is based on the analysis of oblique Digisonde-to-Digisonde (D2D) “skymap” observations for the direct identification of TIDs and the specification of the TID wave parameters. The technique is based on the measurement of angle-of-arrival, Doppler frequency, and time-of-flight of ionospherically reflected high-frequency (HF) radio pulses. The technique has been tested and implemented for the first time in the framework of the Net-TIDE research project (NATO SPS) with data streaming from the network of European Digisonde DPS4D observatories. In the framework of the new TechTIDE EC H2020 project we are demonstrating the performance for a period of moderate auroral activity, assessing its consistency with independent measurement such as the electron density profiles and the GNSS TEC. In addition the TID extracted parameters are compared with the results of the GNSS TEC de-trending and gradient methodologies. The results provide evidence for the reliability of the extracted TID characteristics in respect to prevailing geophysical conditions.

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