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And radio waves to detect tsunamis. This isn't necessarily a new idea, but it has expanded on over the last little while. Our oceans, they're constantly moving. They're moving up and down. The leaves are moving up and down. Swells are moving up and down. Tides are moving back and forth. And that's displacing the atmosphere above it, which leads to corresponding ripples being imprinted on the upper atmosphere. And as these waves ripple across the atmosphere, ionic reactions occur. Electrons are altered and this affects radio communications. As electron numbers increase in the atmosphere, time delay happens between signals from navigation satellites to ground-based stations. Measuring these signal delays tells scientists that something is happening way up in the ionosphere. It so happens that there is a GNSS, Based Upper Atmospheric Real-Time Disaster Information Alert Network, this is referred to as GUARDIAN, that is a near real-time atmospheric monitoring software that's used in conjunction with existing natural hazards for early warning systems. And the NRT's main function is to keep track of total electron content, time series. This lets observers watch ionospheric perturbations that happen due to human-made and natural events.