Global Noise Plot

The plot below shows the noise level (median of the standard deviation of TEC time series across different constellations) across magnetic latitudes for the past eight weeks. For each magnetic latitude, the station with the least noise is selected. The planetary Kp and Ap indices are also plotted as indicators of geomagnetic activity and space weather conditions (see

Global Noise Plot Global Noise Plot, High Resolution


Generic GUARDIAN map


Explore data from yesterday at midnight UTC.

Generic GUARDIAN map

Two Days Ago

Explore data from two days ago at midnight UTC.


Explore Examples

GUARDIAN Map of 2022 Hunga Volcano Eruption

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.

GUARDIAN Map of 2012 Haida Gwaii Tsunami

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.

GUARDIAN Map of 2017 Geomagnetic storm

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.

link to GDGPS

Powered by the JPL Global Differential GPS (GDGPS) System