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AIDA: A Real-Time Global Ionosphere/Plasmasphere Data Assimilation Model
  • +3
  • Benjamin Reid,
  • David R. Themens,
  • Sean Elvidge,
  • Mohammad Afraz Ahmed,
  • Jenny Wong,
  • Warrick Ball
Benjamin Reid

Corresponding Author:[email protected]

Author Profile
David R. Themens
Sean Elvidge
Mohammad Afraz Ahmed
Jenny Wong
Warrick Ball


The Advanced Ionospheric Data Assimilation (AIDA) is a real-time data assimilation model of global 3D ionosphere and plasmasphere electron density. Changes in the local space environment can occur on very short timescales, particularly during disturbed geomagnetic conditions. This space weather has an impact on many modern systems including Global Navigation Satellite System (GNSS) signals and High Frequency radio communications. To provide an ionospheric specification in real-time, AIDA ingests data streams from over 2000 GNSS receivers, using observations from both the Global Positioning System (GPS) and Galileo constellations, along with ionosonde-derived characteristics from the Global Ionosphere Radio Observatory (GIRO). These measurements are assimilated using a particle filter into the empirical NeQuick ionosphere model and Neustrelitz Plasmasphere Model (NPSM). The GNSS receiver Differential Code Biases (DCBs) are solved self-consistently using Rao-Blackwellized particle filtering. AIDA produces output at three latencies, the real-time Ultra Rapid product, the near-real-time Rapid product which operates at a 90-minute delay, and the Final product with a one day lag. The Ultra Rapid and Rapid products also include forecast products out to 6 hours ahead of real time. 
02 Jan 2024Submitted to ESS Open Archive
13 Jan 2024Published in ESS Open Archive