Abstract
The main objective of the TechTIDE project (warning and mitigation technologies for travelling ionospheric disturbances effects) is the development of an identification and tracking system for travelling ionospheric disturbances (TIDs) which will issue warnings of electron density perturbations over large world regions. The TechTIDE project has put in operation a real-time warning system that provides the results of complementary TID detection methodologies and many potential drivers to help users assess the risks and develop mitigation techniques tailored to their applications. The TechTIDE methodologies are able to detect in real time activity caused by both large-scale and medium-scale TIDs and characterize background conditions and external drivers, as an additional information required by the users to assess the criticality of the ongoing disturbances in real time. TechTIDE methodologies are based on the exploitation of data collected in real time from Digisondes, Global Navigation Satellite System (GNSS) receivers and Continuous Doppler Sounding System (CDSS) networks. The results are obtained and provided to users in real time. The paper presents the achievements of the project and discusses the challenges faced in the development of the final TechTIDE warning system.
Highlights
The Earth’s upper atmosphere is directly affected by the solar variability, by the near-Earth space dynamics and lower atmosphere phenomena
The TechTIDE warning system provides the results of complementary Travelling ionospheric disturbances (TIDs) detection methodologies and many potential drivers to help the users assess the risks and develop mitigation strategies tailored to their applications
The TID detection methodologies deployed in the TechTIDE project rely on data retrieved from ionosonde and Global Navigation Satellite System (GNSS) observations
Summary
The Earth’s upper atmosphere is directly affected by the solar variability, by the near-Earth space dynamics and lower atmosphere phenomena. Excitation of large-scale gravity waves occurs even under quiet geomagnetic conditions with relatively low energy depositions but optimal source properties (Mayr et al, 1990) These results indicate that perturbations detected in the ionospheric characteristics due to TIDs and the source of their excitation do not have a one-to-one correspondence. Establishment of permanent networks to detect TIDs excited in the lower atmosphere: To identify TIDs triggered by mechanisms acting below the ionosphere altitudes, i.e. MSTIDs, specific methodologies are employed These include the Continuous Doppler Sounding System (CDSS) and the GNSS detrending.
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