How to Navigate
Draw rectangle on map to select stations, zoom in/out to focus on regions, then click on the station in the sidebar to see realtime slant TEC. Station background noise level from the last 24 hours is shown as (
Data Availability
Near-real-time TEC data from GUARDIAN are available through the NASA Crustal Dynamics Data Information System (CDDIS)
Legend
GPS
GLONASS
GALILEO
BEIDOU
Earthquake
USGS Tsunami Watch
GDGPS Station
Archive
Explore Examples
2022 Hunga Volcano Eruption
The Hunga volcano on the islands of Hunga Tonga and Hunga Ha’apai erupted on January 15, 2022, producing the largest ionospheric signal ever observed. Atmospheric waves produced by the eruption circled the globe several times.
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2012 Haida Gwaii Tsunami
On October 27, 2012 an earthquake of moment magnitude 7.8 occurred on the Haida Gwaii archipelago off the west coast of Canada. A tsunami alert was issued in the US State of Hawaii and over 100,000 people were evacuated. Gravity waves from the tsunami reached the ionosphere hours before the tsunami reached the coast of Hawaii.
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2017 Geomagnetic Storm
On September 7-8, 2017, a severe geomagnetic storm (Kp ~8) triggered severe ionospheric disturbances. These disturbances caused severe disruptions in satellite navigation and radio communication, and are visible in the noise in TEC time series around the world.
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