> The GNSS-based Upper Atmospheric Realtime Disaster Information and Alert Network (GUARDIAN) is an ionospheric monitoring yadayadayadascience<p>That's a pretty impressive number of scrabble points for a project acronym, and I guess bonus points for building that acronym on top of another acronym (GNSS = Global Navigation Satellite System, generic term for America's GPS).<p>I know government projects have a long, storied history of such wordplay. Anyone have any fun stories on coming up with a really elaborate one? I wonder if chatGPT will unleash a new era of creativity with these...
Tangentially related ...
I've heard that earthquakes can be detected, perhaps even prior to the event, by changes in the ionosphere.<p>But last I checked, the serious geologists I worked with had an almost religious aversion to "precursor signals". Has the state of the art changed there?
This sounds very similar to the method discussed in this podcast to detect rocket launches: <a href="https://www.armscontrolwonk.com/archive/1216884/detecting-missile-launches-with-ionospheric-disturbances/" rel="nofollow">https://www.armscontrolwonk.com/archive/1216884/detecting-mi...</a>
This is amazing work. I don't quite understand how they are detecting the tsunamis though. They mention that this works via significant displacements of air. Is the amount of air displacement in the open ocean statistically significant for detection or is it being detected via a slightly different source.
Very interesting article. It also illustrates how dangerous unit conversions are especially combined with thousands separators: 20000km (GNSS satellite altitude) is NOT 12.4 miles.<p>Does anyone know if it would be feasible nowadays to just use starlink (or other LEO satellites) as a GNSS constellation? Even without precise onboard-clocks, would it not be possible to just bounce clock signals from earth as long as latency is known?
Wow that would be great! The high number of casualties during the 2002 tsunami mostly was due to a lack of early alerting, as not enough tsunami buoys were deployed. This could have save so many lives.
I don't get it, are the figures here typos?<p>> Given that GNSS satellites typically travel in medium Earth orbit, approximately 20,000 km or 12.4 miles above the surface, GNSS systems are well suited for detecting fluctuations in ionospheric density.
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> Further, because ground stations can detect GNSS satellites from such a significant distance (up to 1,200 km),...<p>Should that be 2000 km and 1240 mi?
Live map here - <a href="https://guardian.jpl.nasa.gov/" rel="nofollow">https://guardian.jpl.nasa.gov/</a><p>I don't understand, something happens every day. It's been running for years. Are the predicting it our not?<p>Have they timestamped a prediction/analysis beating other methods and had it confirmed afterwards?<p>How often is it wrong, how often is it right when they make calls real time?