Ionospheric Delay

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What is the definition of ionospheric delay?

GNSS signal propagation delay – Earth’s upper atmosphere is loaded with electrons caused by ionizing solar radiation that can “bend” and reflect radio waves.

Range: ± 5 m. Signal propagation delay – upper atmosphere is loaded with electrons caused by ionizing solar radiation that can “bend” and reflect radio waves.

What are the applications for ionospheric delay?